The Nut,union, cataloged under National Stock Number 4730-00-392-2701, 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 Hatch & Kirk, Inc.. Government technical data includes 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-392-2701 |
| Primary Part Number | 3371079 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Shoulder Step Width | 0.125 INCHES NOMINAL IN |
| Shoulder Width | 0.156 INCHES NOMINAL IN |
| Thread Series | UNF |
| Hole Configuration Style | CONFIGURATION F |
| Nut Counterbore Depth | 0.125 INCHES NOMINAL OVERALL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.250 INCHES IN |
| Nut Diameter | 1.562 INCHES NOMINAL IN |
| Counterbore Diameter | 1.312 INCHES NOMINAL OVERALL IN |
| Nut Height | 1.000 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.042 INCHES NOMINAL IN |
| Nut Style | ROUND |
| Thread Class | 2B |
| Thread Quantity Per Inch | 24 |
| Material | COPPER ALLOY OVERALL |
| Smallest Inside Diameter | 0.865 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN |
| Hole Type and Quantity | 3 DRILLED |
| Shoulder Seat Diameter | 1.010 INCHES MINIMUM AND 1.020 INCHES MAXIMUM 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 |
|---|---|
| 3371079 PRIMARY | Hatch & Kirk, Inc. (USA) |
| 2-528-001-530 PRIMARY | Viking Pump, Inc (USA) |
| Reference | Meaning |
|---|---|
| C64X5 | 5/9 Secondary reference Viking Pump, Inc |
| 3371079 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 4730-00-392-2701 is a Nut,union, manufactured by Hatch & Kirk, Inc., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-392-2701 has 2 manufacturer part numbers on file: 3371079 (Hatch & Kirk, Inc.), 2-528-001-530 (Viking Pump, Inc).
Key specifications for 3371079: Shoulder Step Width: 0.125 INCHES NOMINAL IN; Shoulder Width: 0.156 INCHES NOMINAL IN; Thread Series: UNF; Hole Configuration Style: CONFIGURATION F. 18 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.