The Screw,shoulder, cataloged under National Stock Number 5305-01-643-1865, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-643-1865 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.125 INCHES NOMINAL IN |
| Head Height | 0.177 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Shoulder Length | 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM ALL SHOULDERS IN |
| Surface Treatment Document and Classification | ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2460 INCHES MINIMUM AND 0.2480 INCHES MAXIMUM ALL SHOULDERS IN |
| Thread Length | 0.375 INCHES NOMINAL IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Material Document and Classification | ASTM A453/A453M,GRADE 660,CLASS B(S66286) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.1900 INCHES IN |
| Head Style | FLAT FILLISTER |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 05047-ASME B18.24-2015 NATIONAL STD/SPEC |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 130000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.357 INCHES MINIMUM AND 0.375 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 |
|---|---|
| AES20U250500AX8A31 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-643-1865 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-643-1865: Width Across Flats: 0.125 INCHES NOMINAL IN; Head Height: 0.177 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Fastener Length: 0.500 INCHES NOMINAL IN; Shoulder Length: 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM ALL SHOULDERS IN. 21 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.