The Washer,flat, cataloged under National Stock Number 5310-01-563-5517, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-563-5517 |
| Primary Part Number | 7X-0579 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Overall Diameter | 0.346 INCHES NOMINAL IN |
| Supplementary Features | MATERIAL: HARDENED STEEL; FITS BOLT SIZES: 5/16"; COATING: ZINC FLAKE OFFERS MEDIUM TO HIGH CORROSION PROTECTION AND REPEATABLE ASSEMBLY PERFORMANCE VIA BUILT IN LUBRICATION; SALT SPRAY RESISTANCE OF 720 HOURS TO RED RUST; COATING COLOR: BLACK (M12 AND SMALLER); GREY (LARGER THAN M12) |
| Outside Diameter | 1.004 INCHES NOMINAL IN |
| Color | BLACK OVERALL |
| Surface Treatment | ZINC OVERALL |
| Material | STEEL OVERALL |
| Thickness | 0.079 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 |
| Part Number | Manufacturer |
|---|---|
| 7X-0579 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 198-1725 | 3/9 Design control — primary reference Caterpillar Inc Div Caterpillar Defense |
NSN 5310-01-563-5517 is a Washer,flat, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-563-5517 has 1 manufacturer part number on file: 7X-0579 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 7X-0579: Overall Diameter: 0.346 INCHES NOMINAL IN; Supplementary Features: MATERIAL: HARDENED STEEL; FITS BOLT SIZES: 5/16"; COATING: ZINC FLAKE OFFERS MEDIUM TO HIGH CORROSION PROTECTION AND REPEATABLE ASSEMBLY PERFORMANCE VIA BUILT IN LUBRICATION; SALT SPRAY RESISTANCE OF 720 HOURS TO RED RUST; COATING COLOR: BLACK (M12 AND SMALLER); GREY (LARGER THAN M12); Outside Diameter: 1.004 INCHES NOMINAL IN; Color: BLACK OVERALL. 7 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.