The Nut,union, cataloged under National Stock Number 4730-01-244-2260, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 13 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-244-2260 |
| Primary Part Number | 2640-330 PC 16 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Width Across Flats | 4.250 INCHES NOMINAL IN |
| Shoulder Step Width | 0.500 INCHES NOMINAL IN |
| Shoulder Width | 0.281 INCHES NOMINAL IN |
| Thread Series | UNF |
| Material Document and Classification | QQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 3.250 INCHES IN |
| Nut Height | 1.656 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | NICKEL OVERALL |
| Smallest Inside Diameter | 1.406 INCHES NOMINAL IN |
| 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 |
|---|---|
| 2640-330 PC 16 | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 2640-330 PC 16 | 3/2 Design control — primary reference U.S. Government activity |
| 845-2444821 | D/9 Drawing number reference only U.S. Government activity |
| 2640-330 | D/9 Drawing number reference only U.S. Government activity |
| 845-2444821 PC 16 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-244-2260 is a Nut,union, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-244-2260 has 1 manufacturer part number on file: 2640-330 PC 16 (Derbyshire Machine & Tool Co).
Key specifications for 2640-330 PC 16: Width Across Flats: 4.250 INCHES NOMINAL IN; Shoulder Step Width: 0.500 INCHES NOMINAL IN; Shoulder Width: 0.281 INCHES NOMINAL IN; Thread Series: UNF. 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.