The Washer,recessed, cataloged under National Stock Number 5310-00-988-7646, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-988-7646 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES ALL SURFACES |
| Top Recess Diameter | 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Bottom Recess Diameter | 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM |
| Top Recess Angle | 90.0 DEGREES NOMINAL |
| Style Designator | RECESSED BOTH SIDES |
| Material Document and Classification | AMS5637 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.558 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN |
| Recess Depth | 0.013 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN |
| Material Thickness | 0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN |
| Bottom Recess Angle | 90.0 DEGREES NOMINAL |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.200 INCHES MINIMUM AND 0.205 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 |
| Reference | Meaning |
|---|---|
| 2-060-192-02 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-988-7646 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-988-7646: Surface Finish: 63.0 MICROINCHES ALL SURFACES; Top Recess Diameter: 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN; Bottom Recess Diameter: 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM. 14 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.