The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-01-252-8301, 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 The Boeing Company Div Defense. Government technical data includes 12 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 | 4730-01-252-8301 |
| Primary Part Number | 75B310001-2001 |
| Item Name | Inverted Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Seat Angle in Deg | 20.0 |
| Style Designator | INVERTED NUT, TUBE, FLARE |
| Material Document and Classification | AMS 5610 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 7/16-20 |
| Screw Thread Series Designator | UNF |
| Surface Treatment | PASSIVATE |
| Thread Class | 3A A |
| Material | STEEL COMP 416SE |
| Smallest Inside Diameter | 0.316 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 |
|---|---|
| 75B310001-2001 PRIMARY | The Boeing Company Div Defense (USA) |
NSN 4730-01-252-8301 is a Inverted Nut,tube Coupling, manufactured by The Boeing Company Div Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-252-8301 has 1 manufacturer part number on file: 75B310001-2001 (The Boeing Company Div Defense).
Key specifications for 75B310001-2001: Width Across Flats: 0.500 INCHES NOMINAL IN; Seat Angle in Deg: 20.0; Style Designator: INVERTED NUT, TUBE, FLARE; Material Document and Classification: AMS 5610 ASSN STD SINGLE MATERIAL RESPONSE. 12 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.