The Washer,lock, cataloged under National Stock Number 5310-00-255-6809, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Haldex Brake Products Corporation. Government technical data includes 5 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 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 | 5310-00-255-6809 |
| Primary Part Number | 4-X-11 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Haldex Brake Products Corporation |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.493 INCHES NOMINAL IN |
| Material Thickness | 0.062 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Hole Diameter | 0.255 INCHES MINIMUM AND 0.267 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 |
| Part Number | Manufacturer |
|---|---|
| 4-X-11 PRIMARY | Haldex Brake Products Corporation (USA) |
NSN 5310-00-255-6809 is a Washer,lock, manufactured by Haldex Brake Products Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-255-6809 has 1 manufacturer part number on file: 4-X-11 (Haldex Brake Products Corporation).
1 possible match (shared part number, not a government interchangeability claim): 3110-01-259-7242. Verify interchangeability with system specifications before substitution.
Key specifications for 4-X-11: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.493 INCHES NOMINAL IN; Material Thickness: 0.062 INCHES NOMINAL IN; Material: STEEL OVERALL. 5 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.