The Washer,flat, cataloged under National Stock Number 5310-01-499-6575, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. 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 | 5310-01-499-6575 |
| Primary Part Number | SS52H0281Z0500 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS 5516 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5903 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5904 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5905 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5906 MIL SPEC 1ST TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.281 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-22499, COMPOSITION 3, TYPE 302 MIL SPEC 1ST MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PLASTIC POLYURETHANE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL CORROSION RESISTING OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.500 INCHES NOMINAL IN |
| Thickness | 0.090 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 |
| Part Number | Manufacturer |
|---|---|
| SS52H0281Z0500 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5310-01-499-6575 is a Washer,flat, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-499-6575 has 1 manufacturer part number on file: SS52H0281Z0500 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for SS52H0281Z0500: Surface Treatment Document and Classification: AMS 5516 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5903 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5904 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5905 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 5906 MIL SPEC 1ST TREATMENT RESPONSE OVERALL; Overall Diameter: 0.281 INCHES NOMINAL IN; Material Document and Classification: MIL-S-22499, COMPOSITION 3, TYPE 302 MIL SPEC 1ST MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.