The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-01-186-2671, 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 Triumph Controls, Llc Dba Triumph Controls, Llc. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-186-2671 |
| Primary Part Number | 5368203-3 |
| Item Name | Inverted Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Triumph Controls, Llc Dba Triumph Controls, Llc |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Seat Angle in Deg | 30.0 |
| Tube Outside Diameter for Which Designed | 0.250 INCHES NOMINAL IN |
| Style Designator | INVERTED NUT, TUBE, FLARE |
| Material Document and Classification | FED STD 66, COMP 4130 FED STD SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 0.438-20 |
| Screw Thread Series Designator | UNF |
| Thread Class | 2A A |
| Material | STEEL COMP 4130 |
| Fabrication Method | ROD STOCK, MACHINED |
| Smallest Inside Diameter | 0.276 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 |
|---|---|
| 5368203-3 PRIMARY | Triumph Controls, Llc Dba Triumph Controls, Llc (USA) |
| Reference | Meaning |
|---|---|
| ST9M439-2 | 5/9 Secondary reference The Boeing Company Div Defense |
| ST9M39 | D/9 Drawing number reference only The Boeing Company Div Defense |
| ST9M39-2 | 5/9 Secondary reference The Boeing Company Div Defense |
NSN 4730-01-186-2671 is a Inverted Nut,tube Coupling, manufactured by Triumph Controls, Llc Dba Triumph Controls, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-186-2671 has 1 manufacturer part number on file: 5368203-3 (Triumph Controls, Llc Dba Triumph Controls, Llc).
Key specifications for 5368203-3: Width Across Flats: 0.500 INCHES NOMINAL IN; Seat Angle in Deg: 30.0; Tube Outside Diameter for Which Designed: 0.250 INCHES NOMINAL IN; Style Designator: INVERTED NUT, TUBE, FLARE. 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.