The Washer,flat, cataloged under National Stock Number 5310-01-649-9684, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Brighton Best Pty Ltd. Government technical data includes 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-649-9684 |
| Primary Part Number | 371120/373021 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Brighton Best Pty Ltd |
| Status | ACTIVE |
| Center Hole Width | 14.0 MILLIMETERS NOMINAL MM |
| Overall Diameter | 27.0 MILLIMETERS NOMINAL MM |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Features Provided | CASEHARDENED |
| Color | BLACK OVERALL |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Thickness | 3.1 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| 371120/373021 | Brighton Best Pty Ltd (AUS) |
| HWZSM9122740-01 | Haulmark Trailers (australia) Pty Ltd (AUS) |
| WR43ZM12 | Hobson Engineering Co Pty Ltd (AUS) |
| Reference | Meaning |
|---|---|
| ASTM F436M | 5/1 Secondary reference U.S. Government activity |
| ASTM F436M-TY1 M12 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-649-9684 is a Washer,flat, manufactured by Brighton Best Pty Ltd, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-649-9684 has 3 manufacturer part numbers on file: 371120/373021 (Brighton Best Pty Ltd), HWZSM9122740-01 (Haulmark Trailers (australia) Pty Ltd), WR43ZM12 (Hobson Engineering Co Pty Ltd).
3 possible matches (shared part number, not a government interchangeability claim): 5310-01-651-3486, 5310-01-651-3489, 5310-01-651-3490. Verify interchangeability with system specifications before substitution.
Key specifications for 371120/373021: Center Hole Width: 14.0 MILLIMETERS NOMINAL MM; Overall Diameter: 27.0 MILLIMETERS NOMINAL MM; Hardness Rating: 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM; Features Provided: CASEHARDENED. 10 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.