The Screw,shoulder, cataloged under National Stock Number 5305-01-298-0645, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-298-0645 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.312 INCHES NOMINAL IN |
| Head Height | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Fastener Length | 4.465 INCHES MINIMUM AND 4.505 INCHES MAXIMUM IN |
| Shoulder Length | 3.745 INCHES MINIMUM AND 3.755 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.621 INCHES MINIMUM AND 0.623 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.720 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | AMS 6415 ASSN STD 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 140000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 13 |
| Material | STEEL COMP 4340 OR STEEL COMP E4340 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.853 INCHES MINIMUM AND 0.875 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 |
| Reference | Meaning |
|---|---|
| MS21301-77 | 2/2 Government specification standardization U.S. Government activity |
NSN 5305-01-298-0645 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-298-0645: Width Across Flats: 0.312 INCHES NOMINAL IN; Head Height: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Fastener Length: 4.465 INCHES MINIMUM AND 4.505 INCHES MAXIMUM IN; Shoulder Length: 3.745 INCHES MINIMUM AND 3.755 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.