The Nut,plain,cap, cataloged under National Stock Number 5310-01-531-6539, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company Div Bind. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-531-6539 |
| Primary Part Number | 90666 |
| Item Name | Nut,plain,cap |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastenal Company Div Bind |
| Status | ACTIVE |
| Width Across Flats | 17.5 MILLIMETERS MINIMUM AND 19.0 MILLIMETERS MAXIMUM MM |
| Nut Height | 21.1 MILLIMETERS MINIMUM AND 22.0 MILLIMETERS MAXIMUM MM |
| Nut Style | CAP |
| Material | ZINC OVERALL |
| 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 |
|---|---|
| M12 DIN587 | Fastenal Company Div Bind (USA) |
| 90666 PRIMARY | Fastenal Company Div Bind (USA) |
| M12 DIN587 | Kelvion Machine Cooling B.v. (NLD) |
NSN 5310-01-531-6539 is a Nut,plain,cap, manufactured by Fastenal Company Div Bind, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-531-6539 has 3 manufacturer part numbers on file: M12 DIN587 (Fastenal Company Div Bind), 90666 (Fastenal Company Div Bind), M12 DIN587 (Kelvion Machine Cooling B.v.).
1 possible match (shared part number, not a government interchangeability claim): 2590-01-699-7849. Verify interchangeability with system specifications before substitution.
Key specifications for 90666: Width Across Flats: 17.5 MILLIMETERS MINIMUM AND 19.0 MILLIMETERS MAXIMUM MM; Nut Height: 21.1 MILLIMETERS MINIMUM AND 22.0 MILLIMETERS MAXIMUM MM; Nut Style: CAP; End Item Identification: BOX COOLER K98-0-0908, K38-0-0909, K74-0-0931, K38-0-0932. 4 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.