The Screw,shoulder, cataloged under National Stock Number 5305-01-278-2802, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-278-2802 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Fastener Length | 0.534 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Shoulder Length | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Shoulder Diameter | 0.218 INCHES MINIMUM AND 0.221 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.363 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Supplementary Features | REF DATA T.O.16W9-7-4/ECP 1292,FIG. 116,INDEX 37 REPLACEMENT SCREW |
| Material Document and Classification | MIL-S-5626 UNS G41400 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 UNS G43400 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 UNS G8740 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1580 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.339 INCHES MINIMUM AND 0.381 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 |
|---|---|
| NAS1580A3T6Y | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-278-2802 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-278-2802: Fastener Length: 0.534 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN; Shoulder Length: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 2 FED SPEC ALL TREATMENT RESPONSES OVERALL; Shoulder Diameter: 0.218 INCHES MINIMUM AND 0.221 INCHES MAXIMUM FIRST SHOULDER IN. 22 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.