The Nut,tube Coupling, cataloged under National Stock Number 4730-00-204-0803, 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 Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-204-0803 |
| Primary Part Number | 183655 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Width Across Flats | 0.683 INCHES NOMINAL IN |
| Thread Series | UNF |
| Material Document and Classification | AMS 5640 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Nut Height | 0.625 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 303 PLUS X OVERALL |
| Smallest Inside Diameter | 0.344 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.250 INCHES 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 |
|---|---|
| 183655 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 4730-00-204-0803 is a Nut,tube Coupling, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-204-0803 has 1 manufacturer part number on file: 183655 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 183655: Width Across Flats: 0.683 INCHES NOMINAL IN; Thread Series: UNF; Material Document and Classification: AMS 5640 ASSN STD ALL MATERIAL RESPONSES OVERALL; Seat Angle: 45.00 DEGREES NOMINAL. 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.