The Screw,shoulder, cataloged under National Stock Number 5305-00-021-2578, 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21 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-00-021-2578 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.300 INCHES NOMINAL IN |
| Fastener Length | 6.260 INCHES NOMINAL IN |
| Shoulder Length | 0.029 INCHES NOMINAL SECOND SHOULDER IN |
| Shoulder Length | 5.570 INCHES MINIMUM AND 5.590 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | MIL-F-14072 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.187 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.116 INCHES NOMINAL SECOND SHOULDER IN |
| Thread Length | 0.330 INCHES NOMINAL IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Hardness Rating | 23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 416 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.250 INCHES NOMINAL 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 |
|---|---|
| 106B5740P0001 | 3/9 Design control — primary reference U.S. Government activity |
| 106B5740P1 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-00-021-2578 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-00-021-2578: Head Height: 0.300 INCHES NOMINAL IN; Fastener Length: 6.260 INCHES NOMINAL IN; Shoulder Length: 0.029 INCHES NOMINAL SECOND SHOULDER IN; Shoulder Length: 5.570 INCHES MINIMUM AND 5.590 INCHES MAXIMUM FIRST SHOULDER 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.