The Washer,lock, cataloged under National Stock Number 5310-01-623-7144, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-623-7144 |
| Primary Part Number | 12492376 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASTM B633,COND.2,TYPE VI;EMBRITTLEMENT RELIEF PER ASTM B850,CLASS ER-8 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM |
| Style Designator | TWO PIECE INTERLOCKING |
| Material Document and Classification | EN 1.7182 IAW EN10083-3 MFR REF SINGLE MATERIAL RESPONSE OR ASTM A505 OR A506,QUENCH AND TEMPER ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.639 INCHES MINIMUM AND 1.669 INCHES MAXIMUM IN |
| Surface Treatment | ZINC OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 1.108 INCHES MINIMUM AND 1.128 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 |
|---|---|
| 12492376 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| NL27 | 3/9 Design control — primary reference Nord Lock Inc |
NSN 5310-01-623-7144 is a Washer,lock, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-623-7144 has 1 manufacturer part number on file: 12492376 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12492376: Overall Height: 0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN; Surface Treatment Document and Classification: ASTM B633,COND.2,TYPE VI;EMBRITTLEMENT RELIEF PER ASTM B850,CLASS ER-8 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Hardness Rating: 33.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM; Style Designator: TWO PIECE INTERLOCKING. 8 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.