The Washer,flat, cataloged under National Stock Number 5310-00-471-6451, 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 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-471-6451 |
| Primary Part Number | SP126G |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Overall Diameter | 0.5671 INCHES MINIMUM AND 0.5871 INCHES MAXIMUM IN |
| Hardness Rating | 21.2 ROCKWELL C MINIMUM AND 24.7 ROCKWELL C MAXIMUM |
| Material Document and Classification | ASTM A29, UNS G15260 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1524 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.3300 INCHES MINIMUM AND 0.3400 INCHES MAXIMUM IN |
| Thickness | 0.0180 INCHES MINIMUM AND 0.0220 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 |
| Part Number | Manufacturer |
|---|---|
| 3903723 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| SP126G PRIMARY | Bsi Standards Limited (GBR) |
| Reference | Meaning |
|---|---|
| 99-9459071 | 6/9 Informative reference only U.S. Government activity |
| 3903723 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-471-6451 is a Washer,flat, manufactured by Bsi Standards Limited, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-471-6451 has 2 manufacturer part numbers on file: 3903723 (Sps Technologies, Llc Dba PB Fasteners), SP126G (Bsi Standards Limited).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-234-1411. Verify interchangeability with system specifications before substitution.
Key specifications for SP126G: Overall Diameter: 0.5671 INCHES MINIMUM AND 0.5871 INCHES MAXIMUM IN; Hardness Rating: 21.2 ROCKWELL C MINIMUM AND 24.7 ROCKWELL C MAXIMUM; Material Document and Classification: ASTM A29, UNS G15260 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.