The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-678-3439, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Bufab Usa, Inc.. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-678-3439 |
| Primary Part Number | 4762UA43803288 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Bufab Usa, Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.375 INCHES NOMINAL IN |
| Head Height | 0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Thread Length | 1.250 INCHES NOMINAL IN |
| Material Document and Classification | ASTM F879M,CL A1-70,ALLOY 316L ONLY,COLD WORKED S31603 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 05047-ASME B18.24-2015 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 316L OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.550 INCHES MINIMUM AND 0.562 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 |
|---|---|
| 4762UA43803288 | Bufab Usa, Inc. (USA) |
| SHCS006C040BUMAX88 | Veterans Fastener Supply Corp. Dba Veterans Fastener Supply Corp (USA) |
| Reference | Meaning |
|---|---|
| AES14C375A25ED7A11 | 3/2 Design control — primary reference U.S. Government activity |
| AES14C375A25ED7A11 | 3/9 Design control — primary reference The American Society of Mechanical Engineers |
NSN 5305-01-678-3439 is a Screw,cap,socket Head, manufactured by Bufab Usa, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-678-3439 has 2 manufacturer part numbers on file: 4762UA43803288 (Bufab Usa, Inc.), SHCS006C040BUMAX88 (Veterans Fastener Supply Corp. Dba Veterans Fastener Supply Corp).
Key specifications for 4762UA43803288: Width Across Flats: 0.375 INCHES NOMINAL IN; Head Height: 0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Fastener Length: 1.250 INCHES NOMINAL IN; Thread Length: 1.250 INCHES NOMINAL IN. 15 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.