The Washer,lock, cataloged under National Stock Number 5310-00-560-9971, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. 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 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 | 5310-00-560-9971 |
| Primary Part Number | 1738-04 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Style Designator | FLAT INTERNAL TEETH |
| Material Thickness | 0.013 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Hole Diameter | 1.163 INCHES MINIMUM AND 1.175 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 |
|---|---|
| 1738-04 PRIMARY | Naval Inventory Control Point Mechanicsburg (USA) |
NSN 5310-00-560-9971 is a Washer,lock, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-560-9971 has 1 manufacturer part number on file: 1738-04 (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 5315-01-512-2100. Verify interchangeability with system specifications before substitution.
Key specifications for 1738-04: Style Designator: FLAT INTERNAL TEETH; Material Thickness: 0.013 INCHES NOMINAL IN; Surface Treatment: PASSIVATE OVERALL; Part Name Assigned by Controlling Agency: NAVY SPECIAL PROJECT. 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.