The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-276-1640, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-276-1640 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM IN |
| Fastener Length | 2.315 INCHES MINIMUM AND 2.375 INCHES MAXIMUM IN |
| Thread Length | 1.500 INCHES MINIMUM IN |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | ASTM A193 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 1 TYPE |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 105000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 11 |
| Material | STEEL COMP 4140 OR STEEL COMP 4142 OR STEEL COMP 4145 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 |
|---|---|
| M1222RN10C238GANN | 2/2 Government specification standardization U.S. Government activity |
| MIL-DTL-1222 | 4/1 Identification reference U.S. Government activity |
| MIL-S-1222 TY-1 GR-B7 11 UNC | 5/9 Secondary reference U.S. Government activity |
| MI1222 0.625X 2.375LG 2A THD | 5/9 Secondary reference U.S. Government activity |
| MIL-S-1222 | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-1222 0.625X 2.375LG 2A | 5/9 Secondary reference U.S. Government activity |
| 0.625-11UNC-2A X 2.375 LG | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-276-1640 is a Screw,cap,hexagon Head, classified under FSC 5305, Screws. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5306-01-694-3935. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-01-276-1640: Head Height: 0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM IN; Fastener Length: 2.315 INCHES MINIMUM AND 2.375 INCHES MAXIMUM IN; Thread Length: 1.500 INCHES MINIMUM IN; Hardness Rating: 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL. 17 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.