The Washer,flat, cataloged under National Stock Number 5310-01-498-1146, 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 Defense. Government technical data includes 10 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-498-1146 |
| Primary Part Number | 4M25-3 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-F-13924, CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.433 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-6721 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | OXIDE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.193 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN |
| Thickness | 0.057 INCHES MINIMUM AND 0.069 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 |
|---|---|
| 4M25-3 PRIMARY | The Boeing Company Div Defense (USA) |
| 4M25-3 | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| 4M35-3 | 5/9 Secondary reference All Power Manufacturing Co. |
| 4M25-3 | 5/9 Secondary reference Pioneer Machine Products Inc. |
| 4M35-3 | 5/9 Secondary reference Tect Hypervelocity, Inc. |
NSN 5310-01-498-1146 is a Washer,flat, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-498-1146 has 2 manufacturer part numbers on file: 4M25-3 (The Boeing Company Div Defense), 4M25-3 (Anillo Industries Llc).
Key specifications for 4M25-3: Surface Treatment Document and Classification: MIL-F-13924, CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.433 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-6721 MIL 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.