The Screw,assembled Washer, cataloged under National Stock Number 5305-01-607-0621, 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 19 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-607-0621 |
| Primary Part Number | 90401A827 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Extended Washer Thickness | 0.024 INCHES NOMINAL IN |
| Head Height | 0.120 INCHES NOMINAL IN |
| Fastener Length | 0.375 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.381 INCHES NOMINAL IN |
| Primary Washer Outside Diameter | 0.381 INCHES NOMINAL IN |
| Thread Length | 0.375 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | HEXAGON EXTENDED WASHER |
| Primary Washer Style | FLAT INTERNAL TEETH |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.024 INCHES NOMINAL IN |
| Width Between Flats | 0.312 INCHES NOMINAL IN |
| Surface Treatment | ZINC OVERALL |
| Internal Drive Style | TRI-WING RECESS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL 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 |
|---|---|
| 90401A827 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5305-01-607-0621 is a Screw,assembled Washer, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-607-0621 has 1 manufacturer part number on file: 90401A827 (Mcmaster-Carr Supply Co).
Key specifications for 90401A827: Extended Washer Thickness: 0.024 INCHES NOMINAL IN; Head Height: 0.120 INCHES NOMINAL IN; Fastener Length: 0.375 INCHES NOMINAL IN; Extended Washer Diameter: 0.381 INCHES NOMINAL 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.