The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-00-478-0548, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Allison Transmission Inc Dba Allison Transmission, Inc. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-478-0548 |
| Primary Part Number | 23040890 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Allison Transmission Inc Dba Allison Transmission, Inc |
| Status | ACTIVE |
| Width Across Flats | 2.715 INCHES MINIMUM AND 2.762 INCHES MAXIMUM IN |
| Thread Series | UN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.000 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Height | 0.937 INCHES MINIMUM AND 1.063 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL NUT |
| Material | PLASTIC POLYAMIDE NYLON LOCKING INSERT |
| Bearing Surface Type | CHAMFERED |
| 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 |
|---|---|
| 16TX704 | Oshkosh Defense Llc (USA) |
| 23040890 PRIMARY | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| S-3324 | S&s Truck Parts, Llc (USA) |
| Reference | Meaning |
|---|---|
| 6771144 | 5/9 Secondary reference Allison Transmission Inc Dba Allison Transmission, Inc |
| 16TX704 | 5/9 Secondary reference Oshkosh Corp |
NSN 5310-00-478-0548 is a Nut,self-Locking,hexagon, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-478-0548 has 3 manufacturer part numbers on file: 16TX704 (Oshkosh Defense Llc), 23040890 (Allison Transmission Inc Dba Allison Transmission, Inc), S-3324 (S&s Truck Parts, Llc).
Key specifications for 23040890: Width Across Flats: 2.715 INCHES MINIMUM AND 2.762 INCHES MAXIMUM IN; Thread Series: UN; Hardness Rating: 30.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM; Thread Direction: RIGHT-HAND. 13 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.