The Washer,flat, cataloged under National Stock Number 5310-01-345-4971, 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10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-345-4971 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Outside Left Corner Chamfer Angle | 0.01 DEGREES MINIMUM AND 0.03 DEGREES MAXIMUM |
| Overall Diameter | 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5622 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Outside Right Corner Chamfer Angle | 0.01 DEGREES MINIMUM AND 0.03 DEGREES MAXIMUM |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 630 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.313 INCHES MINIMUM AND 0.314 INCHES MAXIMUM IN |
| Thickness | 0.120 INCHES MINIMUM AND 0.130 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 |
|---|---|
| 3090894-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-345-4971 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-345-4971: Outside Left Corner Chamfer Angle: 0.01 DEGREES MINIMUM AND 0.03 DEGREES MAXIMUM; Overall Diameter: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN; Material Document and Classification: AMS5622 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.