The Screw,assembled Washer, cataloged under National Stock Number 5305-01-574-4451, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-574-4451 |
| Primary Part Number | 90316A538 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Head Height | 0.240 INCHES NOMINAL IN |
| Fastener Length | 0.625 INCHES NOMINAL IN |
| Thread Length | 0.625 INCHES NOMINAL IN |
| Hardness Rating | 80.0 ROCKWELL B NOMINAL OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON EXTENDED WASHER |
| Primary Washer Style | FLAT |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 72000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL PROPERTY CLASS 18.8 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Washer Quantity | 1 |
| Head Diameter | 0.375 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 |
| Part Number | Manufacturer |
|---|---|
| 90316A538 | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 90316A538 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-574-4451 is a Screw,assembled Washer, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-574-4451 has 1 manufacturer part number on file: 90316A538 (Mcmaster-Carr Supply Co).
Key specifications for 90316A538: Head Height: 0.240 INCHES NOMINAL IN; Fastener Length: 0.625 INCHES NOMINAL IN; Thread Length: 0.625 INCHES NOMINAL IN; Hardness Rating: 80.0 ROCKWELL B NOMINAL OVERALL. 16 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.