Roll Up Door Parts Diagram: Parts of a Rolling Steel, Sheet, and Truck Roll-Up Door, Named and Sourced

Fort Wayne Dock Door Repair · Research Fort Wayne Dock Door Repair Research is the independent research and reference section of fortwaynedockdoorrepair.com. Last verified: September 11, 2026 · Dataset version 1.1

What are the key roll up door parts diagram facts and counts?

This reference contains 62 numbered callouts across three example diagrams and a 41-row parts crosswalk; those are distinct legend identifiers within each figure and records in this compilation, not a universal parts count. The document counts, model specifications and manufacturer statements below retain their own scope and dates; all were checked on September 11, 2026. The drawings are rolling steel, sheet and truck/trailer.

1. DASMA TDS #277 contains 165 terminology entries: 133 definitions and 32 cross-references. “Roll-Up Door” is one of the cross-references, pointing to “Rolling Door.” Fort Wayne Dock Door Repair counted the June 2020 revision; the entry list is in the dataset. (Source 1)
2. DASMA’s sheet-door terminology has 50 entries. In TDS #283, reaffirmed January 2024, “axle assembly” is the head-assembly term; TDS #277 uses “barrel assembly” for the rolling-door assembly. These are related roles, not proof of identical hardware. (Source 1, Source 2)
3. Whiting’s Premium Dry Freight parts list reaches item number 66. That is the highest item identifier in the undated catalog’s 3/4-inch Premium Dry Freight section, not a count of 66 distinct parts or SKUs. Its truck-door mechanism uses panels, hinges, rollers, tracks, cables and drums rather than a coiling curtain. Retrieved September 11, 2026. (Source 31)
4. The DASMA chart’s 22-gauge bare-steel minimum is 1.69 times its 26-gauge minimum: 0.0269 in. divided by 0.0159 in. This is a ratio of chart values, not measurements of two installed doors. TDS #154, reaffirmed January 2024; calculation by Fort Wayne Dock Door Repair. (Source 3)
5. The Janus and DBCI Model 650 general bills of materials each contain 16 populated part descriptions. Both guides bear document number 810000-0005 and July 19, 2023; numbered spaces 17 and 18 are blank. DBCI’s acquisition by Janus closed August 18, 2021. (Source 24, Source 25, Source 26)
6. Trac-Rite’s 944WL layout has 19 numbered labels. The ©2008 manual includes assemblies, individual components, fasteners and a warning label. Separately, Trac-Rite estimates that Models 944 and its pre-2004 predecessor 940 serve “probably more than 99%” of its own self-storage and garden-shed applications; that is not industry market share. Checked September 11, 2026. (Source 28, Source 30)
7. Cookson’s Rolling Door Illustrator has 11 selectable component labels. Its “Operator Bracket” and “Adjustor Bracket” entries use the same descriptive wording for supporting the counterbalance shaft and curtain. The page has no displayed revision date; checked September 11, 2026. (Source 10)
8. Overhead Door’s cited manual limits hand-chain pull to 35 lb. This applies to Models 610/620/625/627 in manual 300922-0015 Rev. P, September 19, 2024; the Janus/DBCI 650 guides state 35 lb for chain operation and 30 lb for push-up operation. These are manufacturer limits, not a universal diagnostic threshold. (Source 16, Source 24, Source 25)
9. DASMA’s counterbalancing examples have two torque-curve intersections. TDS #272, reaffirmed June 2021, uses hypothetical doors to explain why spring-balanced rolling doors may be out of balance during part of their travel; it does not establish exactly two balance points for every door or diagnose a malfunction. (Source 5)
10. Rolling-fire-door inspection guidance specifies at least annual inspection and drop-testing, with average closing speed of 6–24 in./s. DASMA TDS #271, revised June 2025, and NFPA’s January 2021 rolling-fire-door explanation describe these requirements; NFPA’s April 2025 explanation confirms the minimum annual inspection frequency. Applicable editions and the authority having jurisdiction govern an individual installation. (Source 4, Source 43, Source 44)
11. CornellCookson lists 50,000 cycles for its standard service-door design and 100,000-cycle heavy-duty spring options. The standard service-door page also specifies up to 20 cycles per day. Its springless 300 Series carries a standard warranty of up to 300,000 cycles or two years—not an unlimited-time service-life promise. Product pages checked September 11, 2026. (Source 13, Source 14)
12. Overhead Door’s Model 610 C-600 option lists limits of 70 ft width, 30 ft 4 in. height and 1,500 sq ft area. The 6 in. × 1-3/8 in. slat is offered in 18, 16 or 14 gauge for oversized/special applications. The separate width and height maxima cannot be combined while ignoring the area cap. Checked September 11, 2026. (Source 17)
13. Three corporate groups account for seven of the nine brands in this reference. The reviewed records place Cornell/Cookson in Griffon’s Clopay business, Overhead Door/Wayne Dalton/TODCO in Overhead Door Corporation, and Janus/DBCI in Janus International. This is a count of Table 11, not market share; checked September 11, 2026. (Source 21, Source 26, Source 33, Source 35, Source 49)
14. DASMA’s January 2026 substitution guidance identifies seven wind-critical component categories: slats, windlocks, rivets, bottom bar, guides, assembly bolts and wall fasteners. TDS #287 also says similar slat shape and dimensions do not establish interchangeability. (Source 6)

A roll up door parts diagram has to answer one question before it names anything: which roll-up door? The same three words cover three different mechanisms — a coiling steel-slat door, a corrugated sheet door, and a hinged truck door that rides on tracks — and the door industry’s rolling-door terminology sheet does not make the phrase a primary term. DASMA’s Rolling Door Terminology sheet (TDS #277, revised June 2020) lists “Roll-Up Door” as a cross-reference: “See Rolling Door.” This page draws all three door types, uses 62 numbered callouts, and compares terminology across the six manufacturer columns in Table 5. The callouts are not 62 different components present on one door. (Source 1, Source 2, Source 31)

Contents: Which roll-up door do you have? · Rolling steel door parts (Figure 1) · Sheet door parts (Figure 2) · Truck roll-up door parts (Figure 3) · What each manufacturer calls the same part · Same part or different part? · What this shows and what it doesn't · How this was compiled · How a roll-up door works · Gauge and thickness · Which parts get inspected and wear · Does a name prove a replacement fits? · Standards behind the names · Who makes roll-up doors · Indiana note · Why this matters now · Limitations · How to cite · Download · FAQ · Sources

Which roll-up door do you have?

Three different products are sold and searched for as "roll-up doors," and each one has its own vocabulary: the rolling steel door (a coiling curtain of interlocking slats, defined in DASMA TDS #277), the rolling sheet door (a coiling curtain of corrugated sheets, defined in DASMA TDS #283), and the truck or trailer roll-up door (hinged panels on rollers and tracks, lifted by cables — not covered by either DASMA sheet). Identify the door first; the diagram and the part names follow from it.

The fastest check is the door leaf itself. Narrow horizontal steel strips that hook into each other are slats: a rolling steel door. Corrugated sheets joined at horizontal seams form a sheet-door curtain — a construction used in self-storage and commercial openings. Flat panels with visible hinge rows, rolling on wheels in a track that curves back under the roof, is a truck door. The three-way comparison below is this reference’s assembly of the cited primary descriptions, not a claim that no similar comparison exists elsewhere.

Source: DASMA TDS #277 and #283; manufacturer installation manuals and parts lists listed in Source 1, Source 2, Source 10, Source 11, Source 16, Source 21, Source 24, Source 25, Source 27, Source 31. Compiled by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 1, Source 2, Source 10, Source 14, Source 16, Source 21, Source 24, Source 25, Source 27, Source 31.

Two things the table does not say. A rolling grille uses an open curtain rather than the solid slatted curtain in Figure 1. A residential sectional garage door is also a different product: it must not be identified from the coiling-door diagrams simply because someone calls it a “roll-up door.” DASMA’s index lists sectional-door terminology separately from its rolling-door references. (Source 1, Source 7)

What are the parts of a rolling steel (coiling slat) door?

A rolling steel door has an interlocking slat curtain that coils above the opening and travels in guides at its edges. Figure 1 shows a spring-equipped, angle-guide example with 20 numbered callouts; springless models and other guide arrangements differ. Table 2 explains the selected components using DASMA’s June 2020 terminology and the cited manufacturer examples, rather than treating every description as a verbatim or universal DASMA definition. (Source 1, Source 10, Source 14, Source 16, Source 36)

Figure 1 — Rolling steel (coiling slat) door parts diagram.

Spring-equipped identification example, not to scale. Concealed components are represented schematically; the spring symbol is not an installation section. The separate sensing-edge example does not imply that an ordinary bottom seal is a sensor. Source 1, Source 10, Source 16, Source 36, Source 38.

Source: Original Fort Wayne Dock Door Repair Research schematic compiled from the primary references listed above; verified September 11, 2026. SVG version.

Source: DASMA TDS #277 (rev. June 2020); Cookson Rolling Door Illustrator (undated); Cornell Defender Series Installation Instructions ES 10-464 Rev. 004 (Oct. 5, 2020); Overhead Door Rolling Service Door Installation Instructions 300922-0015 Rev. P (Sept. 19, 2024); Overhead Door Model 610 page. Compiled by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 1, Source 10, Source 11, Source 16, Source 17, Source 36, Source 38.

Fire-door components not drawn in Figure 1 include the fusible link (a heat-responsive link), dropout (a weighted release mechanism) and flame baffle (a hinged closure inside the hood). DASMA TDS #277 marks those three terms as fire-door-only. It also defines a governor, which controls descent during automatic closure, but does not mark that entry with the fire-door-only asterisk. Also not drawn: the inertia brake, also called a safety stop bearing, which DASMA describes as a shaft-associated device that arrests uncontrolled descent following specified drive, brake or spring failures. These are component descriptions, not an inspection or test procedure. (Source 1, Source 4)

What are the parts of a rolling sheet door (self-storage roll-up door)?

A rolling sheet door uses a corrugated curtain instead of individual interlocking slats; the examples reviewed use an axle with drums, formed guides and a spring-setting mechanism. Janus International’s 650 guide (2023) has 16 populated general part descriptions; Trac-Rite’s 944WL layout (©2008) has 19 numbered labels. Figure 2 uses 20 callouts to identify the illustrated assembly and additional configuration-dependent items, including windlocks, a hood and wear strips. (Source 2, Source 24, Source 25, Source 28, Source 29)

Figure 2 — Rolling sheet door parts diagram.

Identification schematic, not to scale. Drum and spring counts depend on the model. The top-draft-stop inset shows its closed-position relationship to the curtain and header, separately from the partly open main view. Source 2, Source 24, Source 25, Source 28, Source 29.

Source: Original Fort Wayne Dock Door Repair Research schematic compiled from the primary references listed above; verified September 11, 2026. SVG version.

Source: DASMA TDS #283 (reaff. Jan. 2024); Janus International 650 Installation Guide 810000-0005 (July 19, 2023); DBCI 650 Installation Guide 810000-0005 (July 19, 2023); Trac-Rite Model 944 manual 522000 rev. H (Apr. 2012), 944WL manual (2008) and 944 product page; Wayne Dalton DS-350 Installation Instructions 291341-0007 REVF (Sept. 9, 2024). Compiled by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 2, Source 21, Source 24, Source 25, Source 27, Source 28, Source 29.

What are the parts of a truck or trailer roll-up door?

A truck roll-up door is a different mechanism with a familiar name: hinged panels run on rollers in tracks and are counterbalanced through lift cables and cable drums; Whiting Door says it built the first practical overhead roll-up door for trucks and trailers in 1953. Its undated parts list reaches item number 66 in the Premium Dry Freight section and 59 in the General Purpose section; those are the highest identifiers, not unique-part counts. Some General Purpose entries carry TODCO cross-reference numbers, which apply to those listed parts rather than to every component sold under either brand. (Source 31, Source 32)

Figure 3 — Truck / trailer roll-up door parts diagram.

Identification schematic, not to scale. The side view shows a cable drum end-on; the separate balancer detail runs across the door width. Whiting part names and model-specific examples are used; the drawing does not establish replacement compatibility. Source 31, Source 47, Source 48.

Source: Original Fort Wayne Dock Door Repair Research schematic compiled from the primary references listed above; verified September 11, 2026. SVG version.

Source: Whiting Door Manufacturing Corp., Whiting Parts List (undated PDF, retrieved Sept. 11, 2026); Whiting Door home page. Compiled by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 31, Source 32, Source 47, Source 48.

One regional footnote belongs here rather than in a trivia box: TODCO describes a history beginning in 1957 and identifies its headquarters in Marion, Ohio, with manufacturing in Ohio and Tecate, Mexico. Its own current company page confirms that it is a division of Overhead Door Corporation. This reference does not assign a Hartford City founding location or a 1962 relocation date, because the company page reviewed does not establish those details. (Source 33)

What does each manufacturer call the same part?

Six manufacturer columns, two DASMA terminology sheets, three door families, one table. Reading across a row shows why parts orders go wrong: the pipe that a rolling steel door coils on is a "barrel assembly" in DASMA TDS #277, a "Counter-Balance Shaft" on Cookson's illustrator, a "spring barrel" at Wayne Dalton, an "axle" plus a "9-1/2-inch spiral barrel" at Janus, a "live axle assembly" at Trac-Rite, and a "balancer shaft" on a Whiting truck door, where it does a different job.

The full crosswalk (41 rows, with what each part does and the documents supporting each mapping) is in the download; Table 5 presents 25 selected functional groupings. Similar roles across door families do not make the components synonyms or interchangeable.

Full crosswalk CSV: 41 records · Structured dataset JSON

Source: DASMA TDS #277 (rev. June 2020) and #283 (reaff. Jan. 2024); Cookson Rolling Door Illustrator and CornellCookson glossary (undated); Cornell Defender Series Installation Instructions ES 10-464 Rev. 004 (Oct. 5, 2020); Overhead Door Installation Instructions 300922-0015 Rev. P (Sept. 19, 2024) and Model 610 page; Wayne Dalton DS-350 Installation Instructions 291341-0007 REVF (Sept. 9, 2024) and Models 800/800C page; Janus International and DBCI 650 Installation Guides 810000-0005 (July 19, 2023); Trac-Rite Model 944 manual (Apr. 2012), 944WL manual (2008) and product page; Whiting Parts List (undated). "—" means the term was not found in the documents we read, not that the part is absent. Compiled by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 1, Source 2, Source 10, Source 11, Source 12, Source 16, Source 17, Source 21, Source 22, Source 24, Source 25, Source 27, Source 28, Source 29, Source 31, Source 36, Source 38.

Which part names mean the same thing — and which don't?

These nine comparisons separate genuine alternate names from related parts and different mechanisms. The comparisons below are editorial readings of the primary definitions cited; they are not manufacturer-approved substitution tables. Where two names really do describe the same thing, the table says so; where they describe different parts or different mechanisms, it says that instead.

Source: documents listed in the Sources column. Editorial comparison by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 1, Source 2, Source 6, Source 10, Source 21, Source 24, Source 27, Source 31, Source 36, Source 38.

What does this reference show—and what does it not establish?

It shows what parts of three kinds of roll-up door are called, by whom, with the document and date behind the mapping, and it gives a numbered drawing for each type so a reader can identify a component. It does not establish whether a part from one maker fits another maker’s door, what any part costs, how long an installed part will last, or how to adjust a spring-loaded assembly. Those questions require the specific model, order and manufacturer instructions; the documents reviewed do not provide a population-based parts-failure or measured service-life dataset.

The three drawings are examples rather than complete bills of materials. Concealed, optional and alternative components are identified as such; source terminology can describe an entire assembly in one place and an individual member in another. A crosswalk row joins a functional concept across documents, not a promise that every cell names the same physical part. (Source 1, Source 2, Source 6, Source 31, Source 36)

How were this parts diagram and crosswalk compiled?

This reference joins primary terminology documents, installation manuals, parts lists, product specifications and company records; the evidence was rechecked on September 11, 2026. Manufacturer names and functional descriptions are kept distinct from our own counts and comparisons; the source register, entry lists and ledgers make the compilation reproducible; no survey, physical inspection or measurement is represented by these numbers. Diagram counts use distinct numbered legend identifiers within each figure, not every repeated label placement in its alternate views.

What we collected, and how:

• Terminology counts. We compared the transcribed entry lists with DASMA TDS #277 and #283 and counted each labeled entry once, including separately labeled cross-references. TDS #277 has 165 entries: 133 definitions and 32 cross-references; 29 entries carry the document’s fire-door-only asterisk. TDS #283 has 50 entries: 44 definitions and six cross-references. The NFPA entries in the downloadable historical transcription retain abbreviated heading identifiers rather than purporting to give current standard titles. DASMA says these lists are not complete industry vocabularies. (Source 1, Source 2)
• Document counts—not universal parts counts. Janus and DBCI’s Model 650 general bills of materials each have 16 populated descriptions; blank spaces 17 and 18 are excluded. Trac-Rite’s 944WL layout has 19 numbered labels. Cookson’s illustrator has 11 selectable component labels. Whiting’s highest item identifiers are 66 for Premium Dry Freight and 59 for General Purpose; skipped numbers and multiple variants mean those identifiers cannot be treated as unique-part or SKU counts. The parts-count ledger preserves each metric separately. (Source 10, Source 24, Source 25, Source 28, Source 31)
• Crosswalk. The 41 records group related component concepts, then record terminology and model-specific examples from the cited sources. They are not all verbatim labels and are not all exact synonyms: a barrel, a sheet-door axle and a truck-door balancer have related roles but different mechanisms. “—” means a term was not mapped from the selected documents, not that a manufacturer lacks that component. Table 5 presents 25 of the functional groupings; the full records are in the download.
• Drawings. The three original schematic drawings and their callouts were compared with accessible manufacturer illustrations and component descriptions. They remain original identification aids, not manufacturer drawings, dimensioned shop drawings or an engineering review of an installed assembly. Figure 3 uses closed rear and side views and a separately oriented counterbalance detail; the shaft and springs span the door width, not the vehicle’s longitudinal side-view axis. (Source 10, Source 16, Source 24, Source 28, Source 47, Source 48)
• Verification scope. ★ in the downloadable records means the stated fact or attributed statement was checked in the cited primary material. It does not mean the publisher inspected the equipment, read every clause of a separately referenced standard, or independently validated a manufacturer’s performance claim. NFPA and UL explanations are identified as explanations; model ratings are identified as manufacturer specifications. No unresolved ● entry is presented as a verified direct-code claim.
• Dates and versions. “Rev.” and “reaff.” dates belong to the documents; access and verification dates belong to this compilation. A document retrieved in 2026 does not become a 2026 specification. Version 1.1 reconciles the article and download source IDs, distinguishes callouts from unique parts, records the Whiting cable-length conflict, and removes adjustment procedures from the public data.

We ran no survey, inspected no doors, and measured nothing. The original work is the assembly and reconciliation, including explicit conflicts and applicability boundaries. Reproduction consists of counting the included entry rows by their classification, checking the manufacturer figure identifiers against the cited pages, and following the source IDs shared by the article and downloads.

How does a roll-up door actually work?

A spring-balanced coiling door combines a curtain, a head assembly and a counterbalance that offsets the curtain’s hanging load. In the illustrated steel design the springs are inside the barrel; in the illustrated sheet design they belong to the axle assembly. DASMA TDS #272 explains that the changing coil diameter produces a non-linear door-torque curve, while its spring-torque examples are approximately linear. (Source 1, Source 2, Source 5)

That difference explains why balance can vary through travel. DASMA uses three hypothetical examples with two intersections between the torque curves; it says a rolling door will in most cases balance in two places, not that every door must have exactly two balance points. Overhead Door and Janus/DBCI provide model-specific operating checks and force limits in their manuals. Those checks are not a license to diagnose a difficult, drifting or damaged door as normal, and this reference does not reproduce a spring-adjustment procedure. Stored-energy components and a changed operating condition require the model-specific assessment described by the manufacturer. (Source 5, Source 16, Source 24, Source 25)

Not every roll-up door has springs. CornellCookson’s Extreme 300 Series is springless and has a standard warranty of up to 300,000 cycles or two years. The document currently served at Wayne Dalton’s model-800hc-specs.pdf URL identifies Model 800C HC and describes a directly driven springless roll with no counterbalance device required; it is a specification template with selectable options, not a record of one installed door. In these examples the motor supplies the lifting effort. CornellCookson separately lists its standard service-door design at up to 20 cycles per day and 50,000 cycles, with a 100,000-cycle spring option. Ratings and warranty limits are not measured field lifespans. (Source 13, Source 14, Source 23)

The drive end and tension end are different functions at the barrel assembly; they should not be assumed to be opposite ends of one uninterrupted shaft. DASMA’s drive-shaft and plug-end descriptions concern the parts that transmit drive torque to the barrel, while the tension wheel belongs to the spring-setting system. Sheet-door configurations include live axles that rotate and dead axles that stay stationary; the operator arrangement therefore depends on the model. The illustrated truck door instead uses a balancer and cables to counterbalance hinged panels, with handles or a strap for manual operation. (Source 1, Source 2, Source 16, Source 24, Source 27, Source 31)

Powered doors add control and protection components. An edge sensor detects an obstruction and signals a compatible operator; the sensor does not itself drive the door. UL’s explanation of commercial door operators describes monitored external entrapment protection for closing modes other than constant-pressure-to-close and a constant-pressure fallback if the protective device is not working. The Janus/DBCI instructions contain corresponding model-specific operating limitations. These descriptions do not establish the required configuration for a particular installation. (Source 24, Source 25, Source 38, Source 45)

How do gauge and thickness describe a roll-up door?

The Janus/DBCI 650 and Trac-Rite 944 specifications use 26-gauge curtains; the rolling-steel examples include several slat gauges, with 14-gauge steel available for the C-600 profile, and DASMA's Metal Gauge Chart (TDS #154, reaffirmed January 2024) puts those numbers in inches: a 26-gauge bare-steel chart minimum is 0.0159 in., the 22-gauge minimum is 0.0269 in., and the 18-gauge minimum is 0.0438 in. Gauge is only one input to strength; DASMA's own note on the chart says structural performance is best determined by pressure testing to ANSI/DASMA 108.

Source: DASMA TDS #154 Metal Gauge Chart (reaff. Jan. 2024), bare-steel and G-90 columns; gauge usage from Janus/DBCI 650 guide (2023), Trac-Rite 944 product page and manual, Overhead Door Model 610 page and the undated Wayne Dalton 800C HC specification template. Compiled by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 3, Source 17, Source 18, Source 23, Source 24, Source 25, Source 29.

Two distinctions matter when reading gauges. These are minimum chart values, not a measurement of a finished painted component; and the bare-steel and G-90 columns differ by 0.0015 in. in each of the eight rows reproduced here. The 1.69 ratio compares only the selected bare-steel minimums, not strength, wind rating or finished-door performance. (Source 3)

Which roll-up door parts are inspected, and what do the manuals say about wear?

The reviewed manuals identify inspection items and schedules, not component failure rates. Overhead Door and Janus/DBCI include monthly visual checks, Trac-Rite provides monthly and six-month schedules, and Cornell’s Defender manual uses a component-by-component weekly/monthly/quarterly matrix. Table 8 summarizes those documents without turning spring-associated maintenance into a do-it-yourself procedure; no population-based failure-rate estimate was produced. (Source 11, Source 16, Source 24, Source 25, Source 27)

Source: documents named in the first column; see Source 4, Source 11, Source 16, Source 24, Source 25, Source 27. Compiled by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 4, Source 11, Source 16, Source 24, Source 25, Source 27.

A pattern runs through the reviewed lists: contacting and moving components recur in the inspection schedules, including slats and endlocks, guides, felt tape, wear strips, bottom bars, stops, chains and sprockets. That is an observation about these documents, not a ranking of failure frequency. Cookson’s March 20, 2023 spring explanation says large rolling security doors can exceed 800 lb; this is a manufacturer example of door weight, not the force at a tension wheel or a weight assigned to every door. Spring and drive work remains governed by the specific manufacturer’s safety instructions. (Source 4, Source 11, Source 15, Source 16, Source 24, Source 27)

Does identifying a part prove a replacement will fit?

No. DASMA's Rolling Door Component Substitution sheet (TDS #287, revised January 2026) says that slats with "the same general shape and dimensions may be, but are not necessarily, interchangeable," that each manufacturer "may use a unique slat design for slat interconnections," and that a replacement bolt must match or exceed the original's grade because a single wrong bolt can compromise safety if it carries curtain load. Naming a part correctly is the start of an order, not the end of one.

Source: DASMA TDS #287, Rolling Door Component Substitution (1/09, 7/14, 4/19, 1/26). Summarized by Fort Wayne Dock Door Repair Research, September 11, 2026. Primary references: Source 6.

The same identification-versus-compatibility distinction matters for the other two door families, although TDS #287 concerns rolling-door component substitution. Janus and DBCI’s 650 guides share a document number and the same populated general bill of materials; common ownership does not by itself establish that every part or revision is interchangeable. Whiting’s General Purpose section provides explicit TODCO cross-references for selected entries, not a brand-wide interchangeability rule. Its Premium and General Purpose examples also use different roller sizes. (Source 6, Source 24, Source 25, Source 26, Source 31)

A conflict inside Whiting’s catalog shows why model context matters: Part 1-11 is described as a 115-inch cable assembly in the Premium Dry Freight section but a 110-inch cable assembly in the Premium Aluminum-Clad section. Both descriptions remain visible here; this reference does not choose one as the correct replacement. The relevant catalog section and actual door identification must be reconciled with the manufacturer. (Source 31)

What standards and codes are behind the part names?

The terminology sheets come from DASMA, an ANSI-accredited standards developer; DASMA’s own history records the American Rolling Door Institute’s 1969 organization and its 2006 merger into DASMA. A terminology sheet is not itself a code or a performance standard. Fire-door requirements, operator protection and product labels have separate references, and Table 10 distinguishes a document’s scope from this page’s verification of an individual requirement. (Source 1, Source 2, Source 8)

Source: DASMA index and primary documents (Source 1, Source 2, Source 3, Source 4, Source 5, Source 6, Source 7, Source 8, Source 9, Source 38); Overhead Door manual (16); Janus/DBCI guides (24, 25); NFPA issuer explanations (43, 44); UL explanation (45); ANSI/NEMA standard listing (46). Compiled and checked by Fort Wayne Dock Door Repair, September 11, 2026. Primary references: Source 1, Source 2, Source 3, Source 4, Source 5, Source 6, Source 7, Source 8, Source 9, Source 16, Source 24, Source 25, Source 38, Source 43, Source 44, Source 45, Source 46.

Who makes roll-up doors, and who owns the brands?

Nine brand names appear in this reference; seven fall within the three corporate groups identified in the key-facts block. Trac-Rite is included in the TBS Companies group, while Whiting describes continuing Whiting-family leadership without supplying a complete equity-ownership register on the page reviewed. These records explain brand relationships, not component compatibility. (Source 21, Source 26, Source 33, Source 34, Source 35, Source 41, Source 42, Source 49)

Source: Griffon acquisition release and current corporate portfolio (35, 49); Wayne Dalton manual (21); TODCO company page (33); Janus acquisition release and guides (24–26); Trachte/TBS company sources (41, 42); Whiting company history (32, 34). Compiled and verified September 11, 2026. Primary references: Source 21, Source 24, Source 25, Source 26, Source 32, Source 33, Source 34, Source 35, Source 41, Source 42, Source 49.

Which official resources apply in Indiana and Allen County?

Door anatomy does not change at the state line, so this reference carries no invented Indiana-specific component statistics. Local questions concern the applicable code, responsible office and records for the actual installation, not a different name for the door’s bottom bar.

The Indiana Department of Homeland Security’s Code Enforcement page provides state fire/building-code resources and information for code officials. Allen County’s Building Department page links the joint Allen County/City of Fort Wayne Citizen Access system for permit and application services. Both office resources were checked September 11, 2026; neither establishes that a particular door drawing is publicly available or that a particular repair does or does not require a permit. Those determinations belong to the relevant office and authority having jurisdiction. (Source 39, Source 40)

The truck-door comparison also has a regional connection through TODCO’s headquarters in Marion, Ohio and its documented history beginning in 1957. Its current company page establishes those facts and its Overhead Door Corporation affiliation; this reference does not turn a separately reported Indiana-origin story into a primary-verified fact. (Source 33)

Why do source revisions and brand relationships matter now?

A component reference needs the document version as well as the part name. DASMA’s component-substitution sheet was revised in January 2026 and its fire-door inspection sheet in June 2025; neither turns an older manual into a current model-specific parts list. (Source 4, Source 6)

The corporate record also has distinct dates: CornellCookson’s acquisition closed in 2018, DBCI’s in 2021, and Trachte described the TBS Companies identity in March 2026. DASMA TDS #277 was revised in June 2020—after the CornellCookson acquisition, before the DBCI acquisition and TBS announcement. Those events do not prove that a design, part or label changed on the transaction date. (Source 1, Source 26, Source 35, Source 42)

Springless designs create another identification boundary: CornellCookson’s 300 Series and the reviewed Wayne Dalton 800C HC specification do not use the spring arrangement shown in Figure 1. Janus ratchet tensioners, Trac-Rite tension-adjustment hardware and Cornell adjusting wheels therefore should not be collapsed into one universal component. Putting the names and document dates side by side supports identification; it does not guarantee that an order will fit the first time. (Source 14, Source 23, Source 24, Source 27, Source 36)

What are the limitations and unresolved source conflicts?

This page identifies parts; it does not establish replacement compatibility, installation dimensions, an assembly’s ratings, prices, measured lifespans or safe repair procedures. The drawings are schematic identification aids, and the document counts describe this collection rather than the universe of roll-up doors. The specific boundaries are:

• Standards are distinguished from explanations. NFPA’s and UL’s own explanatory material was checked, along with DASMA and manufacturer guidance. The full adopted text, local amendments and listing conditions for a specific installation are not reproduced or adjudicated here. (Source 4, Source 6, Source 43, Source 44, Source 45, Source 46)
• Cycle ratings are not field lifespans. Overhead Door’s current Model 625 page directly lists standard 20,000-cycle springs. CornellCookson’s 50,000-cycle design and optional 100,000-cycle springs are different product statements; its 300 Series warranty also has a two-year limit. None is a measured time-to-failure distribution. (Source 13, Source 14, Source 18, Source 19)
• Diagram labels and catalog identifiers are not interchangeable count metrics. The 944WL drawing was visually checked for its 19 labels. The Whiting maxima of 66 and 59 remain highest item identifiers, because skipped numbers and variant listings prevent a unique-component interpretation. The original diagrams contain 20, 20 and 22 numbered legend entries, including concepts repeated between figures. Repeated placements of one number within the same figure are not additional entries. (Source 28, Source 31)
• Historic company details are bounded by the company record. TODCO’s own page supports a history beginning in 1957, Marion headquarters and Overhead Door affiliation. It does not establish the Hartford City founding location or 1962 relocation date, so those details are not asserted. (Source 33)
• Ownership is not compatibility, and family leadership is not a share register. TBS Companies’ relationship to Trac-Rite is directly documented. Whiting describes family leadership; this page does not infer all beneficial owners or an undisclosed parent from that wording. (Source 34, Source 41, Source 42)
• The DASMA counts concern the selected editions. The included entry lists can be recounted. An asterisk is reported as the terminology sheet marks it—even where another unstarred term can also be used on a fire door. The lists are not complete industry dictionaries. (Source 1, Source 2)
• Whiting’s cable-length descriptions conflict. Its undated Parts List #12 describes cable assembly 1-11 as 115 in. in the Premium Dry Freight section but 110 in. in the Premium Aluminum-Clad section. Neither is silently promoted to a universal replacement specification. Whiting’s parts list and Cookson’s illustrator also lack displayed revision dates, so their September 11, 2026 verification date is kept separate from document vintage. (Source 10, Source 31)
• No industry failure-rate, measured service-life, market-size or price dataset was created. Model specifications and the explicitly attributed Trac-Rite application estimate are not field measurements or industry market share. No survey or equipment testing was performed. (Source 13, Source 14, Source 30)
• An unmapped crosswalk cell is not proof of absence. “—” means the selected evidence did not supply a mapped term for this edition. Some rows intentionally compare related assemblies or functions rather than exact synonyms; the row and family notes govern interpretation.

What is the bibliographic reference for this page?

The attribution below identifies this reference and its verified dataset edition. Individual figures, tables and source entries have stable anchors; the document dates remain those of the cited originals.

Fort Wayne Dock Door Repair. “Roll Up Door Parts Diagram: Parts of a Rolling Steel, Sheet, and Truck Roll-Up Door, Named and Sourced.” Fort Wayne Dock Door Repair Research. https://fortwaynedockdoorrepair.com/research/roll-up-door-parts-diagram/. Last verified September 11, 2026. Dataset version 1.1.

What is included in the downloadable dataset?

The CSV contains all 41 crosswalk records, including the 25 functional groupings summarized in Table 5. The JSON includes the same crosswalk plus the source register, document-count ledger, specification ledger, nine-brand corporate record and both terminology-entry lists; source numbers match this page.

Crosswalk CSV — 41 records. Columns: concept, family, dasma_term, dasma_related_terms, cornell_cookson, overhead_door, wayne_dalton, janus_dbci, trac_rite, whiting_truck, what_it_does, sources, tier and checked. Additional mapping notes identify functional comparisons rather than guaranteed synonyms or interchangeable parts.

Complete dataset JSON — version 1.1. Includes the crosswalk; 12 document-count records using their stated count metrics; 41 specification/reference records with source, scope and verification date; nine brand records; the complete source register; and the DASMA TDS #277 and #283 entry lists of 165 and 50 entries. Adjustment turn counts, winding-bar instructions and fastening procedures are not included in this identification dataset.

The original diagram files are available as rolling-steel SVG, sheet-door SVG and truck-door SVG. Corresponding PNG files and the individual ledgers accompany this edition. These are identification schematics, not dimensioned manufacturer drawings.

The filenames retain the September 11, 2026 verification date; version 1.1 distinguishes the corrected edition produced on that date. A later re-verification should receive its actual new verification date rather than an automatic calendar-year change.

What other roll-up door parts questions does this reference answer?

These answers distinguish part names, mechanisms and specification limits. They do not turn a diagram into an installation, adjustment or replacement-approval procedure.

What are the parts of a roll-up door?

It depends which roll-up door. The illustrated spring-balanced rolling-steel door has a slatted curtain, endlocks, bottom bar, guides, barrel, support brackets, counterbalance and the specified operating equipment. Sheet-door examples use corrugated curtain panels, an axle/drum assembly and model-specific tensioning and stop hardware; the illustrated truck door uses hinged panels, rollers, tracks, cables and a balancer. Figures 1–3 contain 62 numbered callouts across those examples, not 62 distinct parts on every door. (Source 1, Source 2, Source 16, Source 24, Source 28, Source 31)

What is the bottom of a roll-up door called?

On a coiling door, the reinforcing member is the bottom bar. DASMA defines it in both terminology sheets; the compressible seal under it is the astragal, while a sensing edge is a distinct signalling component that may use a seal-like housing. On the truck-door examples, the bottom panel carries a bottom U-channel and bottom seal. (Source 1, Source 2, Source 31, Source 38)

What are the side pieces of a roll-up door called?

On a coiling door, they are guides or guide assemblies. The rolling-steel example uses an angle-based assembly with a flared upper entry called a bellmouth; the sheet-door examples use formed guide channels. On the truck-door example, rollers follow vertical tracks into curved and horizontal track sections beneath the roof. (Source 1, Source 2, Source 16, Source 28, Source 31, Source 47)

Is a roll-up door the same as a rolling steel door?

In DASMA TDS #277, “Roll-Up Door” cross-references “Rolling Door,” and “Rolling Steel Door” means a rolling door with a steel curtain. Manufacturer usage also includes sheet doors and hinged truck doors under roll-up terminology. This reference separates those mechanisms instead of treating the phrase as proof that their parts are alike. (Source 1, Source 2, Source 24, Source 31)

Do all roll-up doors have springs?

No. The examples in the three drawings use spring counterbalances, but CornellCookson’s 300 Series and Wayne Dalton’s reviewed Model 800C HC specification describe springless designs. The 300 Series standard warranty is up to 300,000 cycles or two years; that warranty is not evidence that every roll-up door contains springs or has the same service life. (Source 14, Source 23)

How do you set the tension on a roll-up door?

That is not a procedure this page provides. The reviewed manufacturer instructions identify spring and drive assemblies as hazardous stored-energy systems and assign adjustment to trained personnel using the instructions for the specific model. A change in effort, drifting, damage or unusual operation requires assessment; this diagram cannot identify the cause or supply a safe adjustment setting. (Source 15, Source 16, Source 24, Source 27, Source 36, Source 47)

Are roll-up door parts universal?

No. DASMA TDS #287, revised January 2026, says similar slat shape and dimensions do not prove interchangeability and identifies wind-critical components that must be coordinated with the manufacturer. Its fire-door guidance requires manufacturer-compatible repair parts and describes limited exceptions for listed retrofit operators and non-integral items with matching characteristics; it is not permission to substitute by appearance. (Source 6)

How thick is a 26-gauge roll-up door?

DASMA’s January 2024-reaffirmed gauge chart lists minimum thicknesses of 0.0159 in. for 26-gauge bare steel and 0.0174 in. for G-90 galvanized steel. Its 22-gauge bare-steel minimum is 0.0269 in., a 1.69-to-1 ratio to the 26-gauge minimum. These values describe sheet material, not the complete depth of a corrugated or insulated door assembly and not measurements of a particular door. (Source 3)

What is the difference between an endlock and a windlock?

An endlock restrains lateral movement of slats. A windlock engages the guide’s wind-retention feature to resist curtain pullout under the assembly’s rated wind load. Their arrangement is product-specific; similar names or shapes do not establish a replacement’s suitability. (Source 1, Source 6)

Which companies make roll-up doors?

The records reviewed here cover Cornell and Cookson within Griffon’s Clopay business; Overhead Door, Wayne Dalton and TODCO within Overhead Door Corporation; Janus and DBCI within Janus International; Trac-Rite within the TBS Companies group; and Whiting Door Manufacturing. Table 11 supplies the corporate sources and dates without treating ownership as parts compatibility. (Source 21, Source 26, Source 33, Source 34, Source 35, Source 41, Source 42, Source 49)

Which primary sources support this reference?

Each entry identifies the issuing organization, source document or page, and the document date where established. All 49 primary references below were checked for this September 11, 2026 edition; their original revision dates remain distinct from that verification date.

Source 1. DASMA. Rolling Door Terminology, Technical Data Sheet #277, 11 pp.; 9/3/03, rev. 6/12, reaff. 1/13, rev. 1/15, 4/17, reaff. 1/18, rev. 9/18, 9/19, 6/20. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/pubs/TechDataSheets/RollingDoor/TDS277.pdf

Source 2. DASMA. Rolling Sheet Door Terminology, TDS #283, 4 pp.; 12/2013, rev. 6/15, reaff. 6/18, rev. 9/19, reaff. 1/24. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/2024/03/TDS283.pdf

Source 3. DASMA. DASMA Metal Gauge Chart, TDS #154; 10/9/03, rev. 12/10, reaff. 9/12, 09/17, 1/24. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/2024/03/TDS154.pdf

Source 4. DASMA. Rolling Steel Fire Doors: Periodic Inspection and Drop-Testing, TDS #271; 11/26/01, rev. 1/15, 3/15, 9/17, 2/21, 1/24, 6/25. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/2026/01/TDS271.pdf

Source 5. DASMA. Rolling Door Counterbalancing, TDS #272; rev. 10/05, reaff. 09/12, rev. 10/17, reaff. 6/21. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/2021/12/TDS272.pdf

Source 6. DASMA. Rolling Door Component Substitution, TDS #287; 1/09, 7/14, 4/19, 1/26. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/2026/07/TDS287.pdf

Source 7. DASMA. Technical Data Sheets: issuer index. No publication or modification date asserted. Verified September 11, 2026.

Primary URL: https://www.dasma.com/technical-data-sheets/

Source 8. DASMA. About Us: organization history and ANSI accreditation. Undated page. Verified September 11, 2026.

Primary URL: https://www.dasma.com/about-us/

Source 9. DASMA. ANSI/DASMA 207-2020, American National Standard: Standard for Rolling Sheet Doors. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/2021/02/ANSIDASMA2072020.pdf

Source 10. CornellCookson (Cookson). Roll Up Door Parts, Components & Workings — Rolling Door Illustrator, undated, Verified September 11, 2026.

Primary URL: https://www.cooksondoor.com/architect-tools-and-resources/rolling-door-101

Source 11. Cornell Iron Works. Defender Series Door Installation Instructions, ES 10-464, ECO #2090, Revision 004, Oct. 5, 2020. Verified September 11, 2026.

Primary URL: https://www.cornelliron.com/docs/default-source/1v-manuals/cornell/es-10-442-installation-instructions-defender-series-cornell26bc5d4f86346a78840eff00003b6d5a.pdf

Source 12. CornellCookson. Rolling Door & Grille Industry Glossary, undated, Verified September 11, 2026.

Primary URL: https://www.cornelliron.com/architect-tools-and-resources/industry-glossary

Source 13. CornellCookson. Rolling Service Doors (20 cycles/day, 50,000 cycles; 100,000-cycle springs), Verified September 11, 2026.

Primary URL: https://www.cornellcookson.com/product/service-doors

Source 14. CornellCookson. Extreme 300 Series High Performance Rolling Door. Standard warranty: up to 300,000 cycles or two years; optional 500,000 cycles/three years. Undated product page. Verified September 11, 2026.

Primary URL: https://www.cornellcookson.com/product/300-series-rolling-door

Source 15. Cookson. Prime Your Roller Door Springs This Spring. March 20, 2023. Manufacturer explanation; not a measured weight or service-life study. Verified September 11, 2026.

Primary URL: https://www.cooksondoor.com/blogs/Cookson/spring-forward!-ready-for-changing-seasons-and-a-rolling-door-spring-primer

Source 16. Overhead Door Corporation. Installation Instructions for Rolling Service Door, Models 610, 620, 625, 627, 300922-0015 Rev. P, Sept. 19, 2024. Verified September 11, 2026.

Primary URL: https://overheaddoor-production-assets.azureedge.net/assets/docs/default-source/commercial-products/rolling-service-doors/rolling-service-door-installation-model-610-620-625-627---300922.pdf?sfvrsn=dae312de_2

Source 17. Overhead Door Corporation. Rolling Steel Service Doors – Model 610, Verified September 11, 2026.

Primary URL: https://www.overheaddoor.com/commercial/commercial-details/rolling-steel-service-doors-610

Source 18. Overhead Door Corporation. Rolling Steel Service Doors – Model 625, Verified September 11, 2026.

Primary URL: https://www.overheaddoor.com/commercial/commercial-details/rolling-steel-service-doors-625

Source 19. Overhead Door Corporation. Rolling Service Doors 625 brochure. Manufacturer-hosted specification reference; width/height limits are independent and configuration-dependent. Verified September 11, 2026.

Primary URL: https://overheaddoor-production-assets.azureedge.net/assets/docs/default-source/commercial-products/rolling-service-doors/model-625/rolling-service-doors-625-brochure.pdf?sfvrsn=723bc376_9

Source 20. Overhead Door Corporation. Model 625 rolling steel door specification template. Selectable options are not a completed installation specification. Verified September 11, 2026.

Primary URL: https://overheaddoor-production-assets.azureedge.net/assets/docs/default-source/commercial-products/rolling-service-doors/model-625/rolling-steel-door-625-specs52149a4b-b72a-46f2-a53c-3f017312f67f.pdf?sfvrsn=1630ddd4_6

Source 21. Wayne Dalton, a division of Overhead Door Corporation. Installation Instructions, Model DS-350 Roll-Up Doors, Windload Rated, With Side Mount Operator, 291341-0007 REVF, Sept. 9, 2024. Verified September 11, 2026.

Primary URL: https://waynedalton-prod-assets-new.azureedge.net/assets/docs/default-source/install/comm/sheet/291341.pdf?sfvrsn=ead9fd5e_20

Source 22. Wayne Dalton. Rolling Service Doors Models 800 & 800C, Verified September 11, 2026.

Primary URL: https://www.wayne-dalton.com/commercial/detail/rolling-service-doors-models-800-800C

Source 23. Wayne Dalton. Section 083323, Upward Coiling Doors, Model 800C HC. Undated specification template; retrieved file is headed Model 800C HC despite its model-800hc filename. Springless direct drive; hood options, not a universal hood requirement. Verified September 11, 2026.

Primary URL: https://waynedalton-prod-assets-new.azureedge.net/assets/docs/default-source/commercial/rolling-service-800-hc-800c-hc/model-800hc-specs.pdf?sfvrsn=95bc7ce3_9

Source 24. Janus International Group. 650 Installation Guide, document 810000-0005, July 19, 2023 (Figure 1 General Bill of Materials; Operation and Maintenance section). Verified September 11, 2026.

Primary URL: https://cdn2.hubspot.net/hubfs/4335336/Installation%20Guides/650-Installation-Guide.pdf

Source 25. DBCI Doors. 650 Installation Guide, document 810000-0005, July 19, 2023. Verified September 11, 2026.

Primary URL: https://www.dbci.com/hubfs/dbci-install-guides/810000-0005%20-%20Instructions%20Model%20650%20-%20DBCI.pdf

Source 26. Janus International Group. Janus International Announces Closing of Acquisition of Building Components Manufacturer DBCI, Aug. 18, 2021. Verified September 11, 2026.

Primary URL: https://ir.janusintl.com/news/press-releases/detail/28/janus-international-announces-closing-of-acquisition-of

Source 27. Trac-Rite Door, Inc. Rolling Curtain Door Manual — Installation, Maintenance, Parts, Model 944, 522000 rev. H, Apr. 2012. Verified September 11, 2026.

Primary URL: https://www.tracrite.com/wp-content/uploads/2022/12/Print944manualD.pdf

Source 28. Trac-Rite Door, Inc. Rolling Curtain Door Installation, Maintenance & Parts Manual, Windlock Model 944WL, © 2008 (Door Assembly – Parts Layout). Verified September 11, 2026.

Primary URL: https://www.tracrite.com/wp-content/uploads/2022/12/Print944WLManualB.pdf

Source 29. Trac-Rite Door, Inc. Roll Up Door 944 (product specifications), Verified September 11, 2026.

Primary URL: https://www.tracrite.com/roll-up-door-944/

Source 30. Trac-Rite Door, Inc. Support Center (model identification; "probably more than 99%"), Verified September 11, 2026.

Primary URL: https://www.tracrite.com/support-center/

Source 31. Whiting Door Manufacturing Corp. Parts List #12. Undated manufacturer catalog. Premium Dry Freight and General Purpose item identifiers; internal Part 1-11 cable-length conflict retained. Verified September 11, 2026.

Primary URL: https://www.whitingdoor.com/documents/customer-support/resources/WhitingPartsList.pdf

Source 32. Whiting Door Manufacturing Corp. Home page ("first practical overhead roll-up door for trucks and trailers in 1953"), Verified September 11, 2026.

Primary URL: https://www.whitingdoor.com/

Source 33. TODCO. About Us ("a division of Overhead Door Corporation"; Marion, Ohio and Tecate, Mexico), Verified September 11, 2026.

Primary URL: https://todco.com/about-us/

Source 34. Whiting Door Manufacturing Corp. Company History. Manufacturer history and family-leadership account; not a beneficial-ownership register. Verified September 11, 2026.

Primary URL: https://www.whitingdoor.com/company/history

Source 35. Griffon Corporation. Griffon Corporation Completes CornellCookson Acquisition, June 4, 2018. Verified September 11, 2026.

Primary URL: https://ir.griffon.com/news-releases/news-release-details/griffon-corporation-completes-cornellcookson-acquisition

Source 36. Cornell Iron Works. Service Door Installation Instructions, ES 10-476, Rev. 004, July 21, 2023. Verified September 11, 2026.

Primary URL: https://www.cornelliron.com/docs/default-source/1v-manuals/cornell/im_rolling_door5bbb5d4f86346a78840eff00003b6d5a.pdf

Source 37. Janus International Group. 2000 Installation Guide, 810014-0001, November 9, 2021. Verified September 11, 2026.

Primary URL: https://www.janusintl.com/hubfs/Imported_Blog_Media/Janus%20Commercial/810014-0001%20-%20Instructions%2C%20Model%202000.pdf

Source 38. DASMA. Edge Sensors, TDS #368, revised November 2022. Verified September 11, 2026.

Primary URL: https://www.dasma.com/wp-content/uploads/2022/12/TDS368.pdf

Source 39. Indiana Department of Homeland Security. Code Enforcement: state fire/building-code resources. Verified September 11, 2026.

Primary URL: https://www.in.gov/dhs/fire-and-building-safety/code-enforcement/

Source 40. Allen County, Indiana. Building Department: official department and Citizen Access resource route. Verified September 11, 2026.

Primary URL: https://www.allencounty.in.gov/234/Building-Department

Source 41. Trachte. Careers: TBS Companies business list, including Trac-Rite. Undated page. Verified September 11, 2026.

Primary URL: https://www.trachte.com/careers/

Source 42. Trachte. Trachte Unveils Refreshed Brand as It Celebrates 125 Years. March 12, 2026; TBS Companies identity. Verified September 11, 2026.

Primary URL: https://www.trachte.com/press-release/trachte-unveils-refreshed-brand-as-it-celebrates-125-years/

Source 43. NFPA. Frequently Asked Questions About Fire Doors and NFPA 80. April 11, 2025. Issuer explanation, including minimum annual inspection and qualified-person requirements. Verified September 11, 2026.

Primary URL: https://www.nfpa.org/news-blogs-and-articles/blogs/2025/04/11/fire-doors-faqs

Source 44. NFPA. How Is a Rolling Fire Door Inspection Different From a Swinging Door? January 15, 2021. Issuer explanation of annual inspection and 6–24 in./s average closing-speed range. Verified September 11, 2026.

Primary URL: https://www.nfpa.org/news-blogs-and-articles/blogs/2021/01/15/How-is-a-rolling-fire-door-inspection-different-that-a-swinging-door

Source 45. UL. New U.S.–Canada Binational Standard Published for Door and Gate Operators and Systems. September 11, 2018. UL 325 explanation. Verified September 11, 2026.

Primary URL: https://www.ul.com/news/new-us-canada-binational-standard-published-door-and-gate-operators-and-systems

Source 46. ANSI Webstore / NEMA. ANSI Z535.4-2023, Product Safety Signs and Labels. Standard catalog and scope. Verified September 11, 2026.

Primary URL: https://webstore.ansi.org/standards/nema/ansiz5352023-2516192

Source 47. Whiting Door Manufacturing Corp. Premium Dry Freight Installation Drawing, D1037-2, dated December 10, 2002. Visual mechanism reference only. Verified September 11, 2026.

Primary URL: https://www.whitingdoor.com/documents/customer-support/installation/installation-drawings/plywood-core-dry-freight/Premium-Dry-Freight-Installation-Drawing.pdf

Source 48. Whiting Door Manufacturing Corp. General Purpose Dry Freight Installation Drawing, D4656 Rev. A. Visual mechanism reference only. Verified September 11, 2026.

Primary URL: https://www.whitingdoor.com/documents/customer-support/installation/installation-drawings/plywood-core-dry-freight/General-Purpose-Dry-Freight-Installation-Drawing.pdf

Source 49. Griffon Corporation. Corporate business portfolio: Clopay, Cornell and Cookson. Current company page. Verified September 11, 2026.

Primary URL: https://griffon.com/