The Washer,flat, cataloged under National Stock Number 5310-00-808-9203, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 14 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 | 5310-00-808-9203 |
| Primary Part Number | 390807 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 90.0 MICROINCHES OUTER |
| Surface Finish | 63.0 MICROINCHES INNER |
| Surface Finish | 63.0 MICROINCHES TOP |
| Overall Diameter | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Heat Treatment | AS FABRICATED |
| Hardness Rating | 72.0 ROCKWELL B MAXIMUM |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | NICKEL ALLOY A OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN |
| Thickness | 0.044 INCHES MINIMUM AND 0.056 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 |
|---|---|
| 390807 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 5310-00-808-9203 is a Washer,flat, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-808-9203 has 1 manufacturer part number on file: 390807 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 390807: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 90.0 MICROINCHES OUTER; Surface Finish: 63.0 MICROINCHES INNER; Surface Finish: 63.0 MICROINCHES TOP. 14 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.