The Washer,lock, cataloged under National Stock Number 5310-01-034-6560, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Woodward, Inc.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-034-6560 |
| Primary Part Number | 1012-957 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Woodward, Inc. |
| Status | ACTIVE |
| Style Designator | FLAT INTERNAL TEETH |
| Outside Diameter | 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN |
| Material Thickness | 0.018 INCHES NOMINAL0.018 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Hole Diameter | 0.125 INCHES NOMINAL0.125 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 |
|---|---|
| 1012-957 PRIMARY | Woodward, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 219174 | 5/9 Secondary reference Woodward, Inc. |
| 5310PL0941576 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5310-01-034-6560 is a Washer,lock, manufactured by Woodward, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-034-6560 has 1 manufacturer part number on file: 1012-957 (Woodward, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 1670-01-134-8369. Verify interchangeability with system specifications before substitution.
Key specifications for 1012-957: Style Designator: FLAT INTERNAL TEETH; Outside Diameter: 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN; Material Thickness: 0.018 INCHES NOMINAL0.018 INCHES NOMINAL IN; 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.