The Washer,flat, cataloged under National Stock Number 5310-01-449-1026, 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10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-449-1026 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Overall Diameter | 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN |
| Hardness Rating | 20.0 ROCKWELL C MINIMUM |
| Material Document and Classification | QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Nondefinitive Spec/std Data | 1 TYPE AND B CLASS |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.401 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN |
| Thickness | 0.045 INCHES MINIMUM AND 0.055 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 |
|---|---|
| MS51496-85 | 2/2 Government specification standardization U.S. Government activity |
| FF-W-92 | 4/1 Identification reference U.S. Government activity |
NSN 5310-01-449-1026 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-449-1026: Overall Diameter: 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN; Hardness Rating: 20.0 ROCKWELL C MINIMUM; Material Document and Classification: QQ-S-766 FED SPEC 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.