The Screw,shoulder, cataloged under National Stock Number 5305-01-521-9042, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-521-9042 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.156 INCHES NOMINAL IN |
| Head Height | 0.187 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN |
| Fastener Length | 1.156 INCHES MINIMUM AND 1.218 INCHES MAXIMUM IN |
| Shoulder Length | 0.997 INCHES MINIMUM AND 1.003 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.311 INCHES MINIMUM AND 0.312 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.406 INCHES MINIMUM AND 0.468 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP XM-7 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.468 INCHES MINIMUM AND 0.531 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 |
|---|---|
| MS51576-28 | 3/2 Design control — primary reference U.S. Government activity |
| MS51576-28 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-521-9042 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-521-9042: Width Across Flats: 0.156 INCHES NOMINAL IN; Head Height: 0.187 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN; Fastener Length: 1.156 INCHES MINIMUM AND 1.218 INCHES MAXIMUM IN; Shoulder Length: 0.997 INCHES MINIMUM AND 1.003 INCHES MAXIMUM FIRST SHOULDER IN. 16 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.