The Screw,assembled Washer, cataloged under National Stock Number 5305-01-137-7758, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 26 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-137-7758 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.090 INCHES NOMINAL IN |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Secondary Washer Relationship to Primary Washer | NOT IDENTICAL |
| Primary Washer Outside Diameter | 0.293 INCHES NOMINAL IN |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Secondary Washer Style | FLAT |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | PAN NO. 2 |
| Primary Washer Style | SPLIT HELICAL RING |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.040 INCHES NOMINAL IN |
| Specification/standard Data | 80205-NAS720 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Secondary Washer Outside Diameter | 0.293 INCHES NOMINAL IN |
| Surface Treatment | TIN FASTENER |
| Surface Treatment | TIN PRIMARY WASHER |
| Surface Treatment | TIN SECONDARY WASHER |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Secondary Washer Material Thickness | 0.016 INCHES NOMINAL IN |
| Thread Quantity Per Inch | 32 |
| Material | COPPER ALLOY 342 FASTENER |
| Material | COPPER ALLOY 510 PRIMARY WASHER |
| Material | COPPER SECONDARY WASHER |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Washer Quantity | 2 |
| Head Diameter | 0.314 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 |
|---|---|
| NAS720B8-8 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-137-7758 is a Screw,assembled Washer, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-137-7758: Head Height: 0.090 INCHES NOMINAL IN; Fastener Length: 0.500 INCHES NOMINAL IN; Secondary Washer Relationship to Primary Washer: NOT IDENTICAL; Primary Washer Outside Diameter: 0.293 INCHES NOMINAL IN. 26 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.