The Washer,spring Tension, cataloged under National Stock Number 5310-01-021-1901, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-021-1901 |
| Item Name | Washer,spring Tension |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-46049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 2.790 INCHES NOMINAL IN |
| Material Thickness | 0.030 INCHES NOMINAL IN |
| Material | STEEL COMP 1075 OVERALL |
| Hole Diameter | 2.400 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 |
| Reference | Meaning |
|---|---|
| 67771 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-021-1901 is a Washer,spring Tension, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5330-01-446-6983, 7045-01-672-2650. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-021-1901: Overall Height: 0.200 INCHES NOMINAL IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM; Material Document and Classification: MIL-S-46049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 2.790 INCHES NOMINAL IN. 6 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.