The Washer,recessed, cataloged under National Stock Number 5310-00-515-7499, 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 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-515-7499 |
| Primary Part Number | 2W21-3 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Legacy Am&m |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Material Document and Classification | AMS 5526 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.441 INCHES MINIMUM AND 0.461 INCHES MAXIMUM IN |
| Material Thickness | 0.064 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN |
| Recess Diameter | 0.271 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | IRON ALLOY 651 OVERALL |
| Hole Diameter | 0.192 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Recess Angle | 90.0 DEGREES NOMINAL |
| 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 |
|---|---|
| 2W21-3 PRIMARY | The Boeing Company Div Legacy Am&m (USA) |
| Reference | Meaning |
|---|---|
| 2W21-3 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-515-7499 is a Washer,recessed, manufactured by The Boeing Company Div Legacy Am&m, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-515-7499 has 1 manufacturer part number on file: 2W21-3 (The Boeing Company Div Legacy Am&m).
Key specifications for 2W21-3: Style Designator: RECESSED; Material Document and Classification: AMS 5526 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.441 INCHES MINIMUM AND 0.461 INCHES MAXIMUM IN; Material Thickness: 0.064 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN. 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.