The Washer,lock, cataloged under National Stock Number 5310-01-661-3863, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Waterous Company. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-661-3863 |
| Primary Part Number | W4110-SS |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Waterous Company |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 1.07 INCHES NOMINAL IN |
| Material Thickness | 0.16 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Diameter | 0.64 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 |
|---|---|
| W4110-SS PRIMARY | Waterous Company (USA) |
| Reference | Meaning |
|---|---|
| 4260814 | 7/2 Vendor item drawing reference Oshkosh Defense Llc |
NSN 5310-01-661-3863 is a Washer,lock, manufactured by Waterous Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-661-3863 has 1 manufacturer part number on file: W4110-SS (Waterous Company).
Key specifications for W4110-SS: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 1.07 INCHES NOMINAL IN; Material Thickness: 0.16 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: WASHER, LOCKING, SPLIT .62 SS. 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.