The Washer,flat, cataloged under National Stock Number 5310-01-633-4331, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Warfare Ctr Aircraft Div. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-633-4331 |
| Primary Part Number | 56416-00070-1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Air Warfare Ctr Aircraft Div |
| Status | ACTIVE |
| Surface Treatment Document and Classification | 5541CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 4.20 INCHES NOMINAL IN |
| Precious Material | GOLD |
| Material Document and Classification | QQ-A-250/11 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 6061 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.640 INCHES NOMINAL IN |
| Thickness | 0.190 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 |
|---|---|
| 56416-00070-1 PRIMARY | Naval Air Warfare Ctr Aircraft Div (USA) |
| Reference | Meaning |
|---|---|
| 56416-00070 | D/9 Drawing number reference only Naval Air Warfare Ctr Aircraft Div |
NSN 5310-01-633-4331 is a Washer,flat, manufactured by Naval Air Warfare Ctr Aircraft Div, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-633-4331 has 1 manufacturer part number on file: 56416-00070-1 (Naval Air Warfare Ctr Aircraft Div).
Key specifications for 56416-00070-1: Surface Treatment Document and Classification: 5541CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 4.20 INCHES NOMINAL IN; Precious Material: GOLD; Material Document and Classification: QQ-A-250/11 FED STD SINGLE MATERIAL RESPONSE OVERALL. 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.