The Washer,flat, cataloged under National Stock Number 5310-01-548-0433, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 7 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-548-0433 |
| Primary Part Number | HS5975-02 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 MIL STD ALL TREATMENT RESPONSES OVERALL |
| Material Document and Classification | ASTM A 240 NATIONAL STD/SPEC ALL MATERIAL RESPONSES OR ASTM A 666 NATIONAL STD/SPEC ALL MATERIAL RESPONSES OR AMS 5640 NATIONAL STD/SPEC ALL MATERIAL RESPONSES OVERALL |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 301 OR STEEL COMP 303 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.995 INCHES NOMINAL 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 5310-01-548-0433 is a Washer,flat, manufactured by The Boeing Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-548-0433 has 2 manufacturer part numbers on file: HS5975-02 (Fraccaro Industries Inc), HS5975-02 (The Boeing Company).
Key specifications for HS5975-02: Surface Treatment Document and Classification: QQ-P-35 MIL STD ALL TREATMENT RESPONSES OVERALL; Material Document and Classification: ASTM A 240 NATIONAL STD/SPEC ALL MATERIAL RESPONSES OR ASTM A 666 NATIONAL STD/SPEC ALL MATERIAL RESPONSES OR AMS 5640 NATIONAL STD/SPEC ALL MATERIAL RESPONSES OVERALL; Surface Treatment: PASSIVATE OVERALL; Peripheral Shape Style: ROUND. 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.