The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-421-8223, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-421-8223 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.226 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN |
| Fastener Length | 4.750 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416, TY2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 1.000 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A 354 GR BD ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| ASME B18.2.1A | 5/1 Secondary reference U.S. Government activity |
| B1821AH038C475N | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-421-8223 is a Screw,cap,hexagon Head, classified under FSC 5305, Screws. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-458-1624. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-01-421-8223: Head Height: 0.226 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN; Fastener Length: 4.750 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416, TY2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 1.000 INCHES NOMINAL IN. 14 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.