The Washer,lock, cataloged under National Stock Number 5310-01-661-3860, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Whelen Engineering Company, Inc. Dba Whelen Engineering Co Inc Div Whelen Engineering Company. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-661-3860 |
| Primary Part Number | 16-1031060-04 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Whelen Engineering Company, Inc. Dba Whelen Engineering Co Inc Div Whelen Engineering Company |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.33 INCHES NOMINAL IN |
| Material Thickness | 0.05 INCHES NOMINAL IN |
| Hole Diameter | 0.020 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 |
|---|---|
| 16-1031060-04 PRIMARY | Whelen Engineering Company, Inc. Dba Whelen Engineering Co Inc Div Whelen Engineering Company (USA) |
| Reference | Meaning |
|---|---|
| 4235250 | 7/2 Vendor item drawing reference Putnam Farms, Inc. |
NSN 5310-01-661-3860 is a Washer,lock, manufactured by Whelen Engineering Company, Inc. Dba Whelen Engineering Co Inc Div Whelen Engineering Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-661-3860 has 1 manufacturer part number on file: 16-1031060-04 (Whelen Engineering Company, Inc. Dba Whelen Engineering Co Inc Div Whelen Engineering Company).
Key specifications for 16-1031060-04: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.33 INCHES NOMINAL IN; Material Thickness: 0.05 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: WASHER, LOCKING, SPLIT NUMBER 10. 4 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.