The Washer,lock, cataloged under National Stock Number 5310-01-661-4259, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-661-4259 |
| Primary Part Number | 4247086 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.334 INCHES MAXIMUM IN |
| Material Thickness | 0.470 INCHES MINIMUM IN |
| Material | COPPER ALLOY OVERALL |
| Hole Diameter | 0.193 INCHES MINIMUM AND 0.200 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 |
|---|---|
| 4247086 PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 75234 | C/1 Advisory reference — outside the item-of-supply concept Fastenal Company Dba Fastenal Co |
NSN 5310-01-661-4259 is a Washer,lock, manufactured by Oshkosh Defense Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-661-4259 has 1 manufacturer part number on file: 4247086 (Oshkosh Defense Llc).
1 possible match (shared part number, not a government interchangeability claim): 6850-01-701-2983. Verify interchangeability with system specifications before substitution.
Key specifications for 4247086: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.334 INCHES MAXIMUM IN; Material Thickness: 0.470 INCHES MINIMUM IN; Part Name Assigned by Controlling Agency: WASHER, LOCK, SPLIT. 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.