The Washer,flat, cataloged under National Stock Number 5310-00-078-4787, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Westinghouse Electric Corp. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-078-4787 |
| Primary Part Number | 309R023H01 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Overall Diameter | 0.980 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN |
| Supplementary Features | NEXT HIGHER ASSY 1430000778865 ON F-4 AIRCRAFT |
| Material Document and Classification | QQ-M-31,COMP.AZ31B FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | MAGNESIUM ALLOY AZ31B OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.551 INCHES MINIMUM AND 0.552 INCHES MAXIMUM IN |
| Thickness | 0.130 INCHES MINIMUM AND 0.150 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 |
|---|---|
| 309R023H01 | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| 309R023H01 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-078-4787 is a Washer,flat, manufactured by Westinghouse Electric Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-078-4787 has 1 manufacturer part number on file: 309R023H01 (Westinghouse Electric Corp).
Key specifications for 309R023H01: Overall Diameter: 0.980 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN; Supplementary Features: NEXT HIGHER ASSY 1430000778865 ON F-4 AIRCRAFT; Material Document and Classification: QQ-M-31,COMP.AZ31B FED SPEC ALL MATERIAL RESPONSES OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.