The Nut,tube Coupling, cataloged under National Stock Number 4730-00-278-8561, 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 Aeronautical Standards Group Dept of Navy and Air Force. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-278-8561 |
| Primary Part Number | AN818-32D |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Aeronautical Standards Group Dept of Navy and Air Force |
| Status | ACTIVE |
| Length to Shoulder | 1.462 INCHES NOMINAL IN |
| Nut Height | 1.734 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Material | ALUMINUM ALLOY OVERALL |
| Nominal Thread Size | 2.500 INCHES IN |
| Smallest Inside Diameter | 2.167 INCHES MINIMUM AND 2.170 INCHES MAXIMUM IN |
| Thread Series | UN |
| Nominal Tube Outside Diameter | 2.000 INCHES IN |
| Nut Style | TUBE COUPLING |
| Thread Quantity Per Inch | 12 |
| Thread Class | 3B |
| Width Across Flats | 2.855 INCHES MINIMUM AND 2.895 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| AN818-32D | Aeronautical Standards Group Dept of Navy and Air Force (USA) |
| 290-32D | Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution (USA) |
| SAE-AS4841 | Sae International Dba Sae International (USA) |
| 720337-32 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| AS4841 | Sae International Dba Sae International (USA) |
| 731857-132 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| 290-32D | Satair A/s (DNK) |
| CA1208 | Clark Equipment Co (USA) |
NSN 4730-00-278-8561 is a Nut,tube Coupling, manufactured by Aeronautical Standards Group Dept of Navy and Air Force, classified under FSC 4730 (No Item Name Available). Status: active.
NSN 4730-00-278-8561 has 8 cross-referenced part numbers: AN818-32D (Aeronautical Standards Group Dept of Navy and Air Force), 290-32D (Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution), SAE-AS4841 (Sae International Dba Sae International), 720337-32 (Lockheed Martin Corporation Div Rms - Mitchel Field), AS4841 (Sae International Dba Sae International) and 3 more.
There are 3 known substitutes for 4730-00-278-8561: 4730-00-273-8561, 4730-00-278-4574, 5935-01-243-8139. Verify interchangeability with system specifications before substitution.
Key specifications for AN818-32D: Length to Shoulder: 1.462 INCHES NOMINAL IN; Nut Height: 1.734 INCHES NOMINAL IN; Surface Treatment: ANODIZE OVERALL; Material: ALUMINUM ALLOY OVERALL. 13 total characteristics are documented in the Federal Logistics Information System.