The Nut,tube Coupling, cataloged under National Stock Number 4730-00-278-8819, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Imperial. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-278-8819 |
| Primary Part Number | 181D |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Imperial |
| Status | ACTIVE |
| Nut Height | 0.781 INCHES NOMINAL IN |
| Thread Series | UNF |
| Fabrication Method | MACHINED |
| Thread Quantity Per Inch | 16 |
| Material | COPPER ALLOY OVERALL |
| Smallest Inside Diameter | 0.503 INCHES NOMINAL IN |
| Nominal Thread Size | 0.687 INCHES IN |
| Width Across Flats | 0.688 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Nominal Tube Outside Diameter | 0.500 INCHES IN |
| Thread Class | 2A A |
| Thread Direction | RIGHT-HAND |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 181D | Imperial (USA) |
NSN 4730-00-278-8819 is a Nut,tube Coupling, manufactured by Imperial, classified under FSC 4730 (No Item Name Available). Status: active.
NSN 4730-00-278-8819 has 1 cross-referenced part number: 181D (Imperial).
There are 2 known substitutes for 4730-00-278-8819: 4730-00-142-1593, 4730-00-288-8011. Verify interchangeability with system specifications before substitution.
Key specifications for 181D: Nut Height: 0.781 INCHES NOMINAL IN; Thread Series: UNF; Fabrication Method: MACHINED; Thread Quantity Per Inch: 16. 12 total characteristics are documented in the Federal Logistics Information System.