The Washer,lock, cataloged under National Stock Number 5310-00-827-2201, 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6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-827-2201 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.556 INCHES NOMINAL IN |
| Material Thickness | 0.130 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.400 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 |
|---|---|
| 659-19 | 3/9 Design control — primary reference Commercial Engineering and Mfg Co |
NSN 5310-00-827-2201 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4320-01-249-1401, 5950-01-396-4966. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-827-2201: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.556 INCHES NOMINAL IN; Material Thickness: 0.130 INCHES NOMINAL IN; Surface Treatment: CADMIUM OVERALL. 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.