The Nut,tube Coupling, cataloged under National Stock Number 4730-01-667-6443, 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 Sae International Dba Sae International. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, 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 | 4730-01-667-6443 |
| Primary Part Number | MS21921-4W |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Nominal Thread Size | 0.4375 INCHES IN |
| Thread Class | 3B |
| Nominal Tube Outside Diameter | 0.250 INCHES IN |
| Width Across Flats | 0.558 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Thread Direction | RIGHT-HAND |
| Thread Quantity Per Inch | 20.0 |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Smallest Inside Diameter | 0.300 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN |
| Nut Style | TUBE COUPLING |
| Nut Height | 0.72 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY OVERALL |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS21921-4W PRIMARY | Sae International Dba Sae International (USA) |
| AS21921-4W | Sae International Dba Sae International (USA) |
| SAE-AS18280 | Sae International Dba Sae International (USA) |
| AS21921-4W | Society of Automotive Engineers Inc (USA) |
NSN 4730-01-667-6443 is a Nut,tube Coupling, manufactured by Sae International Dba Sae International, classified under FSC 4730 (No Item Name Available). Status: active.
NSN 4730-01-667-6443 has 4 cross-referenced part numbers: MS21921-4W (Sae International Dba Sae International), AS21921-4W (Sae International Dba Sae International), SAE-AS18280 (Sae International Dba Sae International), AS21921-4W (Society of Automotive Engineers Inc).
There is 1 known substitute for 4730-01-667-6443: 4730-00-222-8636. Verify interchangeability with system specifications before substitution.
Key specifications for MS21921-4W: Nominal Thread Size: 0.4375 INCHES IN; Thread Class: 3B; Nominal Tube Outside Diameter: 0.250 INCHES IN; Width Across Flats: 0.558 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN. 13 total characteristics are documented in the Federal Logistics Information System.