The Washer,flat, cataloged under National Stock Number 5310-00-545-5297, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Triumph Thermal Systems, Llc. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-545-5297 |
| Primary Part Number | A75571 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Triumph Thermal Systems, Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AN-P-61 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.531 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND W/FLATS |
| Hole Diameter | 0.312 INCHES MINIMUM AND 0.322 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 |
NSN 5310-00-545-5297 is a Washer,flat, manufactured by Triumph Thermal Systems, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-545-5297 has 2 manufacturer part numbers on file: A75571 (Triumph Thermal Systems, Llc), S59-166 (Goodrich Corporation).
Key specifications for A75571: Surface Treatment Document and Classification: AN-P-61 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.531 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: CADMIUM OVERALL. 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.