The Washer,flat, cataloged under National Stock Number 5310-00-437-8693, 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 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-437-8693 |
| Primary Part Number | SP122G |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Surface Treatment Document and Classification | D-T-D 904 05901 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.575 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN |
| Material Document and Classification | S510,BSI MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.328 INCHES MINIMUM AND 0.333 INCHES MAXIMUM IN |
| Thickness | 0.048 INCHES NOMINAL 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 |
|---|---|
| SP122G PRIMARY | Bsi Standards Limited (GBR) |
| Reference | Meaning |
|---|---|
| 99-1013781 | 6/9 Informative reference only U.S. Government activity |
NSN 5310-00-437-8693 is a Washer,flat, manufactured by Bsi Standards Limited, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-437-8693 has 1 manufacturer part number on file: SP122G (Bsi Standards Limited).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-136-2081, 5310-01-497-8490. Verify interchangeability with system specifications before substitution.
Key specifications for SP122G: Surface Treatment Document and Classification: D-T-D 904 05901 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.575 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN; Material Document and Classification: S510,BSI MFR REF 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.