The Washer,lock, cataloged under National Stock Number 5310-00-013-8181, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Army Weapons Command Attn Amswe-Ree-S. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-013-8181 |
| Primary Part Number | 138181 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Army Weapons Command Attn Amswe-Ree-S |
| Status | ACTIVE |
| Style Designator | FLAT INTERNAL TEETH |
| Material Document and Classification | QQ-S-633,FS 1060 TO FS 1080 CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.394 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN |
| Material Thickness | 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Material | STEEL COMP 1060 OR STEEL COMP 1065 OR STEEL COMP 1070 OR STEEL COMP 1075 OR STEEL COMP 1080 OVERALL |
| Hole Diameter | 0.221 INCHES MINIMUM AND 0.231 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 |
|---|---|
| 138181 | Army Weapons Command Attn Amswe-Ree-S (USA) |
| Reference | Meaning |
|---|---|
| 138181 | 3/9 Design control — primary reference General Motors Corp |
| 138181 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 5310-00-013-8181 is a Washer,lock, manufactured by Army Weapons Command Attn Amswe-Ree-S, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-013-8181 has 1 manufacturer part number on file: 138181 (Army Weapons Command Attn Amswe-Ree-S).
3 possible matches (shared part number, not a government interchangeability claim): 5315-00-244-2960, 5330-00-373-3907, 5930-01-475-2596. Verify interchangeability with system specifications before substitution.
Key specifications for 138181: Style Designator: FLAT INTERNAL TEETH; Material Document and Classification: QQ-S-633,FS 1060 TO FS 1080 CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.394 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN; Material Thickness: 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN. 7 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.