The Nut,tube Coupling, cataloged under National Stock Number 4730-01-254-9841, 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 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 15 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. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-254-9841 |
| Primary Part Number | MS21921-4D |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| Status | ACTIVE |
| Surface Treatment | ANODIZE OVERALL |
| Thread Quantity Per Inch | 20 |
| Thread Series | UNF |
| Smallest Inside Diameter | 0.300 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.250 INCHES IN |
| Nut Style | TUBE COUPLING |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Nut Height | 0.719 INCHES NOMINAL IN |
| Length to Shoulder | 0.547 INCHES NOMINAL IN |
| Nominal Thread Size | 0.437 INCHES IN |
| Width Across Flats | 0.562 INCHES NOMINAL IN |
| Specification/standard Data | 96906-MS21921 GOVERNMENT STANDARD |
| Material | ALUMINUM ALLOY 2014 OVERALL |
| Thread Class | 3B |
| Thread Direction | RIGHT-HAND |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS21921-4D | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
NSN 4730-01-254-9841 is a Nut,tube Coupling, manufactured by Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 4730 (No Item Name Available). Status: active.
NSN 4730-01-254-9841 has 1 cross-referenced part number: MS21921-4D (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M).
There is 1 known substitute for 4730-01-254-9841: 4730-00-555-8203. Verify interchangeability with system specifications before substitution.
Key specifications for MS21921-4D: Surface Treatment: ANODIZE OVERALL; Thread Quantity Per Inch: 20; Thread Series: UNF; Smallest Inside Diameter: 0.300 INCHES NOMINAL IN. 15 total characteristics are documented in the Federal Logistics Information System.