The Washer,flat, cataloged under National Stock Number 5310-00-776-7631, 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 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-776-7631 |
| Primary Part Number | 7767631 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Overall Diameter | 1.401 INCHES MINIMUM AND 1.420 INCHES MAXIMUM IN |
| Hardness Rating | 50.0 ROCKWELL B MINIMUM AND 80.0 ROCKWELL B MAXIMUM |
| Material Document and Classification | QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.015 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN |
| Thickness | 0.045 INCHES MINIMUM AND 0.050 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 |
|---|---|
| 7767631 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 8892925 | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| 8892925 | General Motors Corp (USA) |
| Reference | Meaning |
|---|---|
| 5310007767631 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 62.90.121 | 5/9 Secondary reference Sapa Operaciones SL |
NSN 5310-00-776-7631 is a Washer,flat, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-776-7631 has 3 manufacturer part numbers on file: 7767631 (U S Army Tank Automotive Command Amsta-Im-Mm), 8892925 (Allison Transmission Inc Dba Allison Transmission, Inc), 8892925 (General Motors Corp).
Key specifications for 7767631: Overall Diameter: 1.401 INCHES MINIMUM AND 1.420 INCHES MAXIMUM IN; Hardness Rating: 50.0 ROCKWELL B MINIMUM AND 80.0 ROCKWELL B MAXIMUM; Material Document and Classification: QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 9 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.