The Nut,union, cataloged under National Stock Number 4730-01-125-0398, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 14 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-125-0398 |
| Primary Part Number | 7739519 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Width Across Flats | 1.605 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN |
| Shoulder Step Width | 0.156 INCHES NOMINAL IN |
| Shoulder Width | 0.055 INCHES NOMINAL IN |
| Thread Series | UNS |
| Material Document and Classification | QQ-A-225/5,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.375 INCHES IN |
| Nut Height | 1.000 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 14 |
| Material | ALUMINUM ALLOY 2017 OVERALL |
| Smallest Inside Diameter | 0.625 INCHES NOMINAL IN |
| Shoulder Seat Diameter | 1.270 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 |
|---|---|
| 7739519 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 4730-01-125-0398 is a Nut,union, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-125-0398 has 1 manufacturer part number on file: 7739519 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7739519: Width Across Flats: 1.605 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN; Shoulder Step Width: 0.156 INCHES NOMINAL IN; Shoulder Width: 0.055 INCHES NOMINAL IN; Thread Series: UNS. 14 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.