The Washer,recessed, cataloged under National Stock Number 5310-00-249-5178, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-249-5178 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES BOTTOM |
| Surface Finish | 32.0 MICROINCHES TOP |
| Surface Treatment Document and Classification | MIL-A-8625,TY 3 CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | RECESSED |
| Material Document and Classification | QQ-A-225/8,TEMPER T651 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Material Thickness | 0.312 INCHES NOMINAL IN |
| Recess Diameter | 0.760 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN |
| Surface Treatment | ANODIZE OVERALL |
| Hole Diameter | 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN |
| Recess Angle | 79.0 DEGREES MINIMUM AND 81.0 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 |
|---|---|
| B312001099-1 | C/1 Advisory reference — outside the item-of-supply concept Singer Co the Kearfott Div |
| B312001099-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-249-5178 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-249-5178: Surface Finish: 32.0 MICROINCHES BOTTOM; Surface Finish: 32.0 MICROINCHES TOP; Surface Treatment Document and Classification: MIL-A-8625,TY 3 CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: RECESSED. 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.