The Washer,lock, cataloged under National Stock Number 5310-01-661-6529, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Washer,lock |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Oshkosh Defense Llc (CAGE 75Q65) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-661-6529 |
| Primary Part Number | 3885074004 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-LEFT HAND |
| Outside Diameter | 16.0 MILLIMETERS NOMINAL MM |
| Material Thickness | 2.35 MILLIMETERS MINIMUM AND 2.65 MILLIMETERS MAXIMUM MM |
| Material | STEEL OVERALL |
| Hole Diameter | 10.2 MILLIMETERS MINIMUM AND 10.7 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| 3885074004 PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 3885074 | D/9 Drawing number reference only Oshkosh Defense Llc |
NSN 5310-01-661-6529 is a Washer,lock, manufactured by Oshkosh Defense Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-661-6529 has 1 manufacturer part number on file: 3885074004 (Oshkosh Defense Llc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-671-6670. Verify interchangeability with system specifications before substitution.
Key specifications for 3885074004: Style Designator: SPLIT HELICAL-LEFT HAND; Outside Diameter: 16.0 MILLIMETERS NOMINAL MM; Material Thickness: 2.35 MILLIMETERS MINIMUM AND 2.65 MILLIMETERS MAXIMUM MM; 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.