The Nut,plain,round, cataloged under National Stock Number 5310-01-039-6446, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Continental Machine Tool Co., Inc. Dba Continental Machine Tool Co Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-039-6446 |
| Primary Part Number | 2-121-028-03 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Continental Machine Tool Co., Inc. Dba Continental Machine Tool Co Inc |
| Status | ACTIVE |
| Thread Series | UNS |
| Hardness Rating | 35.5 ROCKWELL C MINIMUM |
| Drive Point Width | 0.380 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 3.281 INCHES IN |
| Nut Diameter | 3.790 INCHES NOMINAL IN |
| Counterbore Diameter | 3.310 INCHES NOMINAL NUT IN |
| Drive Point Depth | 0.075 INCHES NOMINAL IN |
| Nut Thickness | 0.280 INCHES NOMINAL IN |
| Surface Treatment | SILVER OVERALL |
| Countersink Angle | 90.0 DEGREES NOMINAL NUT |
| Drive Point Quantity | 8 |
| Nut Style | ROUND |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 2-121-028-03 | Continental Machine Tool Co., Inc. Dba Continental Machine Tool Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 2-121-028-03 | 7/2 Vendor item drawing reference U.S. Government activity |
| 2-121-028-03 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-039-6446 is a Nut,plain,round, manufactured by Continental Machine Tool Co., Inc. Dba Continental Machine Tool Co Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-039-6446 has 1 manufacturer part number on file: 2-121-028-03 (Continental Machine Tool Co., Inc. Dba Continental Machine Tool Co Inc).
Key specifications for 2-121-028-03: Thread Series: UNS; Hardness Rating: 35.5 ROCKWELL C MINIMUM; Drive Point Width: 0.380 INCHES NOMINAL IN; Thread Direction: RIGHT-HAND. 16 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.