The Washer,recessed, cataloged under National Stock Number 5310-01-270-3231, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-270-3231 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | RECESSED |
| Material Document and Classification | AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.958 INCHES MINIMUM AND 0.978 INCHES MAXIMUM IN |
| Recess Depth | 0.029 INCHES MINIMUM AND 0.049 INCHES MAXIMUM IN |
| Material Thickness | 0.068 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN |
| Recess Diameter | 0.667 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | IRON ALLOY 660 OVERALL |
| Hole Diameter | 0.568 INCHES MINIMUM AND 0.579 INCHES MAXIMUM IN |
| Recess Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| VN900-9C | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-270-3231 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-270-3231: Surface Treatment Document and Classification: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: RECESSED; Material Document and Classification: AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.958 INCHES MINIMUM AND 0.978 INCHES MAXIMUM IN. 11 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.