The Screw,shoulder, cataloged under National Stock Number 5305-01-239-1515, 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 19 specifications, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-239-1515 |
| Primary Part Number | WC4020-4-10AY |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | West Coast Aerospace, Inc. |
| Status | ACTIVE |
| Head Height | 0.058 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN |
| Fastener Length | 1.078 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN |
| Shoulder Length | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| 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 | 0.501 INCHES MINIMUM AND 0.506 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 |
|---|---|
| 11879C4-10A | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M902C4-10A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M902C4-10A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| WC4020-4-10AY PRIMARY | West Coast Aerospace, Inc. (USA) |
| HT4020-4-10AY PRIMARY | Hi-Shear Corporation (USA) |
| HT4020-4-10AY PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M902C4-10A | Amg Diamond, Llc Dba Etaglobal, Llc (USA) |
| HT4020-4-10AY PRIMARY | Huck International, Inc (USA) |
| HT4020-4-10AY PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-10AY | 3/2 Design control — primary reference U.S. Government activity |
| 3M902C4-10A | 5/9 Secondary reference U.S. Government activity |
| 3M902C4-10A | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4020-4-10AY | 5/9 Secondary reference U.S. Government activity |
| HT4020-4-10AY | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-239-1515 is a Screw,shoulder, manufactured by West Coast Aerospace, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-239-1515 has 9 manufacturer part numbers on file: 11879C4-10A (Reid Products Inc. Dba Reid Products Inc), 3M902C4-10A (Fastener Innovation Technology, Inc. Dba F I T), 3M902C4-10A (Sps Technologies Ltd, Tj Brooks Division), WC4020-4-10AY (West Coast Aerospace, Inc.), HT4020-4-10AY (Hi-Shear Corporation) and 4 more.
Key specifications for WC4020-4-10AY: Head Height: 0.058 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN; Fastener Length: 1.078 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN; Shoulder Length: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN. 19 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.