The Screw,shoulder, cataloged under National Stock Number 5305-01-185-2212, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is West Coast Aerospace, Inc.. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-185-2212 |
| Primary Part Number | HT4020-4-5AY |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | West Coast Aerospace, Inc. |
| Status | ACTIVE |
| Fastener Length | 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN |
| Shoulder Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.280 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.502 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| HT4020-4-5AY | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-4-5AY PRIMARY | West Coast Aerospace, Inc. (USA) |
| 3M902C4-5A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-4-5AY PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 11879C4-5A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-4-5AY PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-4-5AY PRIMARY | Huck International, Inc (USA) |
| HT4020-4-5AY PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4020-4-5AY PRIMARY | Hi-Shear Corporation (USA) |
| WC4020-4-5AY PRIMARY | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-5AY | 5/9 Secondary reference Sps Technologies Inc |
| 3M902C4-5A | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4020-4-5AY | 5/9 Secondary reference U.S. Government activity |
| HT4020-4-5AY | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-185-2212 is a Screw,shoulder, manufactured by West Coast Aerospace, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-185-2212 has 10 manufacturer part numbers on file: HT4020-4-5AY (Sps Technologies Ltd, Tj Brooks Division), HT4020-4-5AY (West Coast Aerospace, Inc.), 3M902C4-5A (Fastener Innovation Technology, Inc. Dba F I T), HT4020-4-5AY (Fastener Innovation Technology, Inc. Dba F I T), 11879C4-5A (Reid Products Inc. Dba Reid Products Inc) and 5 more.
Key specifications for HT4020-4-5AY: Fastener Length: 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN; Shoulder Length: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.280 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.469 INCHES NOMINAL IN. 18 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.