The Washer,flat, cataloged under National Stock Number 5310-00-511-8129, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mueller Brass Co.. Government technical data includes 10 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-511-8129 |
| Primary Part Number | A8526 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mueller Brass Co. |
| Status | ACTIVE |
| Overall Diameter | 0.669 INCHES MINIMUM AND 0.673 INCHES MAXIMUM IN |
| Heat Treatment | COLD ROLLED AND HALF HARD OR HARD |
| Hardness Rating | 48.0 ROCKWELL C 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 | 0.516 INCHES NOMINAL IN |
| Thickness | 0.061 INCHES MINIMUM AND 0.067 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 |
|---|---|
| A8526 PRIMARY | Mueller Brass Co. (USA) |
NSN 5310-00-511-8129 is a Washer,flat, manufactured by Mueller Brass Co., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-511-8129 has 1 manufacturer part number on file: A8526 (Mueller Brass Co.).
Key specifications for A8526: Overall Diameter: 0.669 INCHES MINIMUM AND 0.673 INCHES MAXIMUM IN; Heat Treatment: COLD ROLLED AND HALF HARD OR HARD; Hardness Rating: 48.0 ROCKWELL C MAXIMUM; Material Document and Classification: QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 10 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.