The Washer,flat, cataloged under National Stock Number 5310-00-471-6450, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bsi Standards Limited. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-471-6450 |
| Primary Part Number | SP126E |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Overall Diameter | 0.502 INCHES MINIMUM AND 0.522 INCHES MAXIMUM IN |
| Hardness Rating | 21.0 ROCKWELL C MINIMUM AND 22.0 ROCKWELL C MAXIMUM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.267 INCHES MINIMUM AND 0.277 INCHES MAXIMUM IN |
| Thickness | 0.017 INCHES MINIMUM AND 0.021 INCHES MAXIMUM 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 5310-00-471-6450 is a Washer,flat, manufactured by Bsi Standards Limited, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-471-6450 has 2 manufacturer part numbers on file: SP126E (Bsi Standards Limited), SP126E (Lentern Intl Inc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-658-4256. Verify interchangeability with system specifications before substitution.
Key specifications for SP126E: Overall Diameter: 0.502 INCHES MINIMUM AND 0.522 INCHES MAXIMUM IN; Hardness Rating: 21.0 ROCKWELL C MINIMUM AND 22.0 ROCKWELL C MAXIMUM; Cross-Sectional Shape Style: RECTANGULAR; Special Features: PER THE UK, THIS IS NOT A DUPLICATE OF NSN 5310-99-680-0061.. 9 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.