The Screw,assembled Washer, cataloged under National Stock Number 5305-00-121-8063, 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22 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-121-8063 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN |
| Fastener Length | 1.313 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN |
| Primary Washer Outside Diameter | 0.494 INCHES MINIMUM AND 0.506 INCHES MAXIMUM IN |
| Thread Length | 1.213 INCHES MINIMUM AND 1.275 INCHES MAXIMUM IN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM FASTENER |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | PAN NO. 2 |
| Primary Washer Style | FLAT EXTERNAL TEETH |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.025 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 1050 PRIMARY WASHER |
| Material | STEEL COMP 1022 FASTENER |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Washer Quantity | 1 |
| Head Diameter | 0.473 INCHES MINIMUM AND 0.492 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 |
|---|---|
| 313742 | 5/9 Secondary reference Outboard Marine Corp Johnson Motors Div |
| 313742 | 5/9 Secondary reference U.S. Government activity |
| FF-S-92 | 4/1 Identification reference U.S. Government activity |
NSN 5305-00-121-8063 is a Screw,assembled Washer, classified under FSC 5305, Screws. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 3020-00-674-3106, 5310-00-872-8510, 5905-01-033-0263. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-00-121-8063: Head Height: 0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN; Fastener Length: 1.313 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN; Primary Washer Outside Diameter: 0.494 INCHES MINIMUM AND 0.506 INCHES MAXIMUM IN; Thread Length: 1.213 INCHES MINIMUM AND 1.275 INCHES MAXIMUM 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.