The Screw,assembled Washer, cataloged under National Stock Number 5305-00-042-5580, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Rolls-Royce Corporation. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-042-5580 |
| Primary Part Number | 425580 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Rolls-Royce Corporation |
| Status | ACTIVE |
| Head Height | 0.172 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Fastener Length | 0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| Primary Washer Outside Diameter | 0.460 INCHES MINIMUM AND 0.475 INCHES MAXIMUM IN |
| Thread Length | 0.523 INCHES MINIMUM AND 0.594 INCHES MAXIMUM IN |
| Material Document and Classification | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Primary Washer Style | FLAT EXTERNAL TEETH |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN |
| Width Between Flats | 0.428 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 1010 OR STEEL COMP 1020 OR STEEL COMP 1050 OVERALL |
| Thread Series Designator | UNF |
| Washer Quantity | 1 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 425580 | Rolls-Royce Corporation (USA) |
| 425580 | Army Weapons Command Attn Amswe-Ree-S (USA) |
| 425580 | General Motors Llc Dba General Motors Llc (USA) |
| Reference | Meaning |
|---|---|
| 5305000425580 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 425580 | 3/9 Design control — primary reference General Motors Corp |
NSN 5305-00-042-5580 is a Screw,assembled Washer, manufactured by Rolls-Royce Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-042-5580 has 3 manufacturer part numbers on file: 425580 (Rolls-Royce Corporation), 425580 (Army Weapons Command Attn Amswe-Ree-S), 425580 (General Motors Llc Dba General Motors Llc).
1 possible match (shared part number, not a government interchangeability claim): 5305-00-494-2272. Verify interchangeability with system specifications before substitution.
Key specifications for 425580: Head Height: 0.172 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN; Fastener Length: 0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL; Primary Washer Outside Diameter: 0.460 INCHES MINIMUM AND 0.475 INCHES MAXIMUM IN. 19 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.