The Washer,flat, cataloged under National Stock Number 5310-00-576-7353, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-576-7353 |
| Primary Part Number | 2W1B25-28-32 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Legacy Am&m |
| Status | ACTIVE |
| Overall Diameter | 0.8594 INCHES MINIMUM AND 0.8906 INCHES MAXIMUM IN |
| Hardness Rating | 64.0 ROCKWELL B MINIMUM AND 76.0 ROCKWELL B MAXIMUM |
| Material Document and Classification | QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Specification/standard Data | 43999-2W1 MANUFACTURERS STANDARD |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY 268 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.390 INCHES MINIMUM AND 0.400 INCHES MAXIMUM IN |
| Thickness | 0.032 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 |
|---|---|
| 2W1B25-28-32 PRIMARY | The Boeing Company Div Legacy Am&m (USA) |
| Reference | Meaning |
|---|---|
| FF-W-92 | 5/9 Secondary reference U.S. Government activity |
| 303252 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 303252 | C/1 Advisory reference — outside the item-of-supply concept Evinrude Motors Product Group of Outboard Marine Corp |
NSN 5310-00-576-7353 is a Washer,flat, manufactured by The Boeing Company Div Legacy Am&m, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-576-7353 has 1 manufacturer part number on file: 2W1B25-28-32 (The Boeing Company Div Legacy Am&m).
2 possible matches (shared part number, not a government interchangeability claim): 5310-00-987-0368, 1005-01-604-0763. Verify interchangeability with system specifications before substitution.
Key specifications for 2W1B25-28-32: Overall Diameter: 0.8594 INCHES MINIMUM AND 0.8906 INCHES MAXIMUM IN; Hardness Rating: 64.0 ROCKWELL B MINIMUM AND 76.0 ROCKWELL B MAXIMUM; Material Document and Classification: QQ-B-613 FED SPEC SINGLE 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.