The Washer,lock, cataloged under National Stock Number 5310-01-526-4961, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Chpt Manufacturing Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-526-4961 |
| Primary Part Number | 1103981 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Chpt Manufacturing Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| 1103981 PRIMARY | Chpt Manufacturing Inc (USA) |
| Reference | Meaning |
|---|---|
| 1103981 | 5/9 Secondary reference Fmc Technologies Inc Dba Fmc Fluid Control |
NSN 5310-01-526-4961 is a Washer,lock, manufactured by Chpt Manufacturing Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-526-4961 has 1 manufacturer part number on file: 1103981 (Chpt Manufacturing Inc).
1 possible match (shared part number, not a government interchangeability claim): 5915-01-719-4060. Verify interchangeability with system specifications before substitution.
Key specifications for 1103981: End Item Identification: TACTICAL WATER PURIFICATION SYS; TWPS 4610-01-488-9656. 0 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.