The Washer,recessed, cataloged under National Stock Number 5310-01-057-3771, 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10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-057-3771 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Style Designator | RECESSED |
| Outside Diameter | 1.562 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN |
| Material Thickness | 0.071 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN |
| Recess Diameter | 1.028 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 4130 OVERALL |
| Hole Diameter | 0.877 INCHES MINIMUM AND 0.881 INCHES MAXIMUM IN |
| Recess Angle | 89.0 DEGREES MINIMUM AND 91.0 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 |
|---|---|
| 5310PL0744868 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| MS21206-C14 | 2/2 Government specification standardization U.S. Government activity |
NSN 5310-01-057-3771 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-057-3771: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Hardness Rating: 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM; Style Designator: RECESSED; Outside Diameter: 1.562 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN. 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.