The Washer,lock, cataloged under National Stock Number 5310-00-949-1971, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-949-1971 |
| Primary Part Number | 11010413 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| Status | ACTIVE |
| Style Designator | FLAT EXTERNAL TEETH |
| Outside Diameter | 0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN |
| Material Thickness | 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN |
| Surface Treatment | ZINC AND PHOSPHATE OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.195 INCHES MINIMUM AND 0.204 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 |
|---|---|
| A20496 | Fnh Uk Ltd (GBR) |
| 11010413 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
| A10752 | Fnh Uk Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 5310PL0918872 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 717124434409 | 6/9 Informative reference only Ncb Hungary (honvedsegi Egyseges Termekkod) |
| 5310009491971 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 11010413 | 5/9 Secondary reference Springfield Armory |
NSN 5310-00-949-1971 is a Washer,lock, manufactured by Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-949-1971 has 3 manufacturer part numbers on file: A20496 (Fnh Uk Ltd), 11010413 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate), A10752 (Fnh Uk Ltd).
2 possible matches (shared part number, not a government interchangeability claim): 5950-01-051-8291, 1330-01-532-1596. Verify interchangeability with system specifications before substitution.
Key specifications for 11010413: Style Designator: FLAT EXTERNAL TEETH; Outside Diameter: 0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN; Material Thickness: 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN; Surface Treatment: ZINC AND PHOSPHATE OVERALL. 6 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.