The Washer,lock, cataloged under National Stock Number 5310-01-559-8240, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. 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 | 5310-01-559-8240 |
| Primary Part Number | 91475A020 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-LEFT HAND |
| Outside Diameter | 0.250 INCHES NOMINAL IN |
| Material Thickness | 0.031 INCHES MINIMUM IN |
| Material | STEEL COMP 316 OVERALL |
| Hole Diameter | 0.148 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 |
| Part Number | Manufacturer |
|---|---|
| 91475A020 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5310-01-559-8240 is a Washer,lock, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-559-8240 has 1 manufacturer part number on file: 91475A020 (Mcmaster-Carr Supply Co).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-586-5191. Verify interchangeability with system specifications before substitution.
Key specifications for 91475A020: Style Designator: SPLIT HELICAL-LEFT HAND; Outside Diameter: 0.250 INCHES NOMINAL IN; Material Thickness: 0.031 INCHES MINIMUM IN; End Item Identification: AN/WLD-1(V), REMOTE MINE HUNTING SYSTEM. 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.