The Nut,plain,round, cataloged under National Stock Number 5310-01-331-7221, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Interspiro Inc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-331-7221 |
| Primary Part Number | 331-102-020 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Interspiro Inc |
| Status | ACTIVE |
| Thread Tolerance Class | 6H INTERNAL |
| Thread Series | M |
| Thread Pitch in Millimeters | 0.50 |
| Drive Point Width | 2.0 MILLIMETERS NOMINAL MM |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 7.50 MILLIMETERS MM |
| Nut Diameter | 9.3 MILLIMETERS MINIMUM AND 9.5 MILLIMETERS MAXIMUM MM |
| Drive Point Depth | 1.0 MILLIMETERS NOMINAL MM |
| Undercut Thickness | 1.0 MILLIMETERS NOMINAL MM |
| Nut Thickness | 3.5 MILLIMETERS NOMINAL MM |
| Small End Diameter | 7.9 MILLIMETERS NOMINAL MM |
| Drive Point Quantity | 12 |
| Nut Style | ROUND |
| Material | PLASTIC POLYAMIDE NYLON 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 |
|---|---|
| 331-102-020 PRIMARY | Interspiro Inc (USA) |
| 6318049 | Naval Sea Systems Command (USA) |
NSN 5310-01-331-7221 is a Nut,plain,round, manufactured by Interspiro Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-331-7221 has 2 manufacturer part numbers on file: 331-102-020 (Interspiro Inc), 6318049 (Naval Sea Systems Command).
Key specifications for 331-102-020: Thread Tolerance Class: 6H INTERNAL; Thread Series: M; Thread Pitch in Millimeters: 0.50; Drive Point Width: 2.0 MILLIMETERS NOMINAL MM. 14 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.