The Washer,lock, cataloged under National Stock Number 5310-00-905-9869, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-905-9869 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Style Designator | COUNTERSINK EXTERNAL TEETH |
| Material Document and Classification | QQ-B-750,COMP A,TEMPER HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.599 INCHES NOMINAL IN |
| Material Thickness | 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN |
| Departure From Cited Designator | AS MOD BY MATERIAL |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
| Material | COPPER ALLOY OVERALL |
| Hole Diameter | 0.318 INCHES MINIMUM AND 0.333 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 |
|---|---|
| MS35336-60 | 4/1 Identification reference U.S. Government activity |
| FF-W-100 | 4/1 Identification reference U.S. Government activity |
NSN 5310-00-905-9869 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-249-3712. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-905-9869: Style Designator: COUNTERSINK EXTERNAL TEETH; Material Document and Classification: QQ-B-750,COMP A,TEMPER HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.599 INCHES NOMINAL IN; Material Thickness: 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN. 8 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.