The Screw,shoulder, cataloged under National Stock Number 5305-01-679-1379, 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21 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-679-1379 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.1560 INCHES NOMINAL IN |
| Head Height | 0.1875 INCHES MINIMUM AND 0.2499 INCHES MAXIMUM IN |
| Fastener Length | 1.6875 INCHES NOMINAL IN |
| Shoulder Length | 1.247 INCHES MINIMUM AND 1.253 INCHES MAXIMUM ALL SHOULDERS IN |
| Surface Treatment Document and Classification | CRES 303 PASSIVATED PER AMS2700,METHOD 1,TYPE II,CLASS 4;CRES 304 AND 302HQ PASSIVATED PER AMS2700,METHOD 1,TYPE 6 OR 7,CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.3110 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM ALL SHOULDERS IN |
| Thread Length | 0.4063 INCHES MINIMUM AND 0.4687 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Material Document and Classification | CONDITION A IAW ASTM A582/A582M AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 1ST MATERIAL RESPONSE OR ASTM A493 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 2ND MATERIAL RESPONSE OR CRES 302HW IAW ASTM A493 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 3RD MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS-51576 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Surface Treatment | PASSIVATE OVERALL |
| Chamfer Angle | 30.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 302 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.4688 INCHES MINIMUM AND 0.5312 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 |
|---|---|
| MS51576-30 | 3/2 Design control — primary reference U.S. Government activity |
| MS51576-30 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-679-1379 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-679-1379: Width Across Flats: 0.1560 INCHES NOMINAL IN; Head Height: 0.1875 INCHES MINIMUM AND 0.2499 INCHES MAXIMUM IN; Fastener Length: 1.6875 INCHES NOMINAL IN; Shoulder Length: 1.247 INCHES MINIMUM AND 1.253 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.