The Washer,flat, cataloged under National Stock Number 5310-00-331-0571, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Legacy Am&m. Government technical data includes 8 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-331-0571 |
| Primary Part Number | 2W1AL10-12-63 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Legacy Am&m |
| Status | ACTIVE |
| Overall Diameter | 0.375 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Specification/standard Data | 43999-2W1 MANUFACTURERS STANDARD |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.156 INCHES NOMINAL IN |
| Thickness | 0.062 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 |
|---|---|
| 2W1AL10-12-63 PRIMARY | The Boeing Company Div Legacy Am&m (USA) |
| 8023400 PRIMARY | Us Army Aviation and Missile Command (USA) |
| Reference | Meaning |
|---|---|
| BA10069-60 | 5/9 Secondary reference Modern Screw Machine Co |
| BA10069-60 | 5/9 Secondary reference American Telephone and Telegraph Co |
| BA10069-60 | 5/9 Secondary reference American Stamping Co |
| BA10069-60 | 5/9 Secondary reference Lucent Technologies Inc Advanced Technology Systems |
| 181962-21 | 5/9 Secondary reference Lockheed Martin Corporation Dba Lockheed Martin Div Lockheed Martin |
NSN 5310-00-331-0571 is a Washer,flat, manufactured by The Boeing Company Div Legacy Am&m, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-331-0571 has 2 manufacturer part numbers on file: 2W1AL10-12-63 (The Boeing Company Div Legacy Am&m), 8023400 (Us Army Aviation and Missile Command).
1 possible match (shared part number, not a government interchangeability claim): 5845-01-467-6265. Verify interchangeability with system specifications before substitution.
Key specifications for 2W1AL10-12-63: Overall Diameter: 0.375 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Specification/standard Data: 43999-2W1 MANUFACTURERS STANDARD; Peripheral Shape Style: ROUND. 8 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.