The Washer,flat, cataloged under National Stock Number 5310-00-900-4560, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-900-4560 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Overall Diameter | 0.531 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Specification/standard Data | 59433-131970 MANUFACTURERS SPECIFICATION |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.144 INCHES NOMINAL IN |
| Thickness | 0.050 INCHES NOMINAL 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 |
|---|---|
| 131970 | 3/9 Design control — primary reference American Telephone and Telegraph Co |
| 131970 | C/1 Advisory reference — outside the item-of-supply concept Lucent Technologies Inc Corporate Headquarters |
| 131970 | 5/9 Secondary reference At and T Corp |
NSN 5310-00-900-4560 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5305-01-242-1109, 6150-01-554-7250. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-900-4560: Overall Diameter: 0.531 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Specification/standard Data: 59433-131970 MANUFACTURERS SPECIFICATION; Surface Treatment: PASSIVATE OVERALL. 9 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.