The Washer,flat, cataloged under National Stock Number 5310-01-176-4000, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-176-4000 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES BOTTOM |
| Surface Finish | 32.0 MICROINCHES TOP |
| Overall Diameter | 4.190 INCHES NOMINAL IN |
| Hardness Rating | 73.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 79.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM |
| Material Document and Classification | ASTM A366 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A569 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A109 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Features Provided | CASEHARDENED |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1009 OR STEEL COMP 1137 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 2.375 INCHES NOMINAL IN |
| Thickness | 0.111 INCHES MINIMUM AND 0.115 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 |
|---|---|
| 13214E2106 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-176-4000 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-176-4000: Surface Finish: 32.0 MICROINCHES BOTTOM; Surface Finish: 32.0 MICROINCHES TOP; Overall Diameter: 4.190 INCHES NOMINAL IN; Hardness Rating: 73.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 79.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM. 12 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.