The Washer,flat, cataloged under National Stock Number 5310-00-021-3657, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-021-3657 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Overall Diameter | 0.370 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN |
| Hardness Rating | 60.0 SHORE DUROMETER A NOMINAL |
| Material Document and Classification | MIL-S-6855,CL 2,GR 60 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Specification/standard Data | 80205-NAS1515 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Minimum Tensile Strength | 1500 POUNDS PER SQUARE INCH LBS |
| Peripheral Shape Style | ROUND |
| Material | RUBBER SYNTHETIC OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.144 INCHES MINIMUM AND 0.154 INCHES MAXIMUM IN |
| Thickness | 0.021 INCHES MINIMUM AND 0.041 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 |
| Reference | Meaning |
|---|---|
| NAS1515J06L | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| NAS1515D06L | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-021-3657 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-00-929-5202. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-021-3657: Overall Diameter: 0.370 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN; Hardness Rating: 60.0 SHORE DUROMETER A NOMINAL; Material Document and Classification: MIL-S-6855,CL 2,GR 60 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 11 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.