The Washer,recessed, cataloged under National Stock Number 5310-01-442-6933, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-442-6933 |
| Primary Part Number | 6405750 FIND AHWA-A12 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Top Recess Diameter | 2.375 INCHES NOMINAL IN |
| Bottom Recess Diameter | 2.375 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-281, CLA FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 3.000 INCHES NOMINAL IN |
| Material Thickness | 0.650 INCHES NOMINAL IN |
| Bottom Recess Angle | 90.0 DEGREES NOMINAL |
| Countersink Angle | 90.0 DEGREES NOMINAL |
| Material | NICKEL ALLOY 400 OVERALL |
| Hole Diameter | 1.015 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 |
|---|---|
| 6405750 FIND AHWA-A12 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6111403-A12 | 5/9 Secondary reference Naval Sea Systems Command |
| 581-6405750 AHWA FIND A12 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 5310-01-442-6933 is a Washer,recessed, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-442-6933 has 1 manufacturer part number on file: 6405750 FIND AHWA-A12 (Naval Sea Systems Command).
Key specifications for 6405750 FIND AHWA-A12: Top Recess Diameter: 2.375 INCHES NOMINAL IN; Bottom Recess Diameter: 2.375 INCHES NOMINAL IN; Material Document and Classification: QQ-N-281, CLA FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 3.000 INCHES NOMINAL 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.