The Washer,recessed, cataloged under National Stock Number 5310-00-321-4660, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-321-4660 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Top Recess Angle | 100.0 DEGREES NOMINAL |
| Style Designator | RECESSED BOTH SIDES |
| Material Document and Classification | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OR AMS6415 ASSN STD SINGLE MATERIAL RESPONSE OR EMS 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.480 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN |
| Material Thickness | 0.055 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN |
| Bottom Recess Angle | 80.0 DEGREES NOMINAL |
| Material | STEEL COMP 4340 OVERALL |
| Hole Diameter | 0.192 INCHES MINIMUM AND 0.195 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 |
|---|---|
| 365263-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-321-4660 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-321-4660: Top Recess Angle: 100.0 DEGREES NOMINAL; Style Designator: RECESSED BOTH SIDES; Material Document and Classification: MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OR AMS6415 ASSN STD SINGLE MATERIAL RESPONSE OR EMS 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.480 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN. 8 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.