The Washer,flat, cataloged under National Stock Number 5310-01-533-3904, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense Llc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-533-3904 |
| Primary Part Number | 9HB57 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Overall Diameter | 0.074 INCHES MINIMUM AND 0.121 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Color | BLACK OVERALL |
| Surface Treatment | DICHROMATE OVERALL |
| Peripheral Shape Style | ROUND |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.526 INCHES MINIMUM AND 0.546 INCHES MAXIMUM IN |
| Thickness | 0.074 INCHES MINIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5310-01-533-3904 is a Washer,flat, manufactured by Oshkosh Defense Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-533-3904 has 2 manufacturer part numbers on file: 107354 (Southeast Industries Llc), 9HB57 (Oshkosh Defense Llc).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-651-1414. Verify interchangeability with system specifications before substitution.
Key specifications for 9HB57: Overall Diameter: 0.074 INCHES MINIMUM AND 0.121 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Color: BLACK OVERALL; Surface Treatment: DICHROMATE OVERALL. 8 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.