The Nut,plain,round, cataloged under National Stock Number 5310-01-233-9779, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-233-9779 |
| Primary Part Number | M-2281 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| Hole Thread Quantity Per Inch | 18 |
| Thread Series | UNS |
| Hole Configuration Style | CONFIGURATION J |
| Drive Point Width | 0.370 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 3.6398 INCHES IN |
| Nut Diameter | 4.938 INCHES NOMINAL IN |
| Drive Point Depth | 0.156 INCHES NOMINAL IN |
| Nut Thickness | 0.562 INCHES NOMINAL IN |
| Drive Point Quantity | 4 |
| Nut Style | ROUND |
| Thread Class | 3 |
| Hole Nominal Thread Diameter | 0.312 INCHES IN |
| Thread Quantity Per Inch | 12 |
| Material | STEEL OVERALL |
| Hole Type and Quantity | 4 TAPPED |
| 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 |
|---|---|
| M2281AH | Marine & Industrial Transmissions Ltd (GBR) |
| M-2281 PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| M-2281-AH PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| Reference | Meaning |
|---|---|
| M2281AH | 5/9 Secondary reference Twin Disc International S a |
NSN 5310-01-233-9779 is a Nut,plain,round, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-233-9779 has 3 manufacturer part numbers on file: M2281AH (Marine & Industrial Transmissions Ltd), M-2281 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic), M-2281-AH (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
Key specifications for M-2281: Hole Thread Quantity Per Inch: 18; Thread Series: UNS; Hole Configuration Style: CONFIGURATION J; Drive Point Width: 0.370 INCHES NOMINAL IN. 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.