The Washer,recessed, cataloged under National Stock Number 5310-01-686-6530, 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10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-686-6530 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Top Recess Diameter | 0.035 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN |
| Bottom Recess Diameter | 0.035 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN |
| Top Recess Angle | 89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM |
| Style Designator | RECESSED BOTH SIDES |
| Outside Diameter | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Material Thickness | 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN |
| Bottom Recess Angle | 89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 630 OVERALL |
| Hole Diameter | 0.375 INCHES MINIMUM AND 0.385 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 |
|---|---|
| 140-007 | D/9 Drawing number reference only U.S. Government activity |
| 140-007-24S24C4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-686-6530 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-686-7290. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-686-6530: Top Recess Diameter: 0.035 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN; Bottom Recess Diameter: 0.035 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN; Top Recess Angle: 89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM; Style Designator: RECESSED BOTH SIDES. 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.