The Nut,tube Coupling, cataloged under National Stock Number 4730-00-554-7397, 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 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 19 commercial cross-references from 11 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4730-00-554-7397 |
| Primary Part Number | MS21921-6W |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Sae International Dba Sae International |
| Status | CANCELLED |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Thread Quantity Per Inch | 18 |
| Smallest Inside Diameter | 0.425 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.375 INCHES IN |
| Specification/standard Data | 81343-AS21921 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |
| Material | ALUMINUM ALLOY 7075 OVERALL |
| Surface Treatment | ANODIZE OVERALL |
| Material Document and Classification | QQ-A-225/6,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Length to Shoulder | 0.578 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Width Across Flats | 0.688 INCHES NOMINAL IN |
| Fabrication Method | MACHINED |
| Thread Direction | RIGHT-HAND |
| Thread Series | UNF |
| Thread Class | 3B |
| Nominal Thread Size | 0.562 INCHES IN |
| Nut Height | 0.800 INCHES NOMINAL IN |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| AS18280 | Society of Automotive Engineers Inc (USA) |
| AS21921 | Society of Automotive Engineers Inc (USA) |
| SAE-AS18280 | Sae International Dba Sae International (USA) |
| MS21921W6 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS21921-6D | Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn (USA) |
| AS18280 | Sae International Dba Sae International (USA) |
| MS21921-6W PRIMARY | Sae International Dba Sae International (USA) |
| 156/1 | Critical Maritime Systems & Support Limited (GBR) |
| MS21921-6D | Globe Aerospace Inc (USA) |
| AS21921 | Sae International Dba Sae International (USA) |
| MS21921-6D | Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters (USA) |
| MS21921-6W | Society of Automotive Engineers Inc (USA) |
| MS21921D6 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS21921-6W | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS21921-6D | Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution (USA) |
| MS21921-6D | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| VSF1212-6WW | Howmet Global Fastening Systems Inc Div Torrance Operations (USA) |
| MS21921-6D | Dana Corp Weatherhead Div (USA) |
| MS21921-6D | Danfoss Power Solutions II, Llc (USA) |
NSN 4730-00-554-7397 is a Nut,tube Coupling, manufactured by Sae International Dba Sae International, classified under FSC 4730 (No Item Name Available). Status: cancelled.
NSN 4730-00-554-7397 has 19 cross-referenced part numbers: AS18280 (Society of Automotive Engineers Inc), AS21921 (Society of Automotive Engineers Inc), SAE-AS18280 (Sae International Dba Sae International), MS21921W6 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS21921-6D (Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn) and 14 more.
There are 12 known substitutes for 4730-00-554-7397: 5330-00-063-9059, 6510-00-100-1612, 5310-00-167-0721 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for MS21921-6W: Seat Angle: 45.00 DEGREES NOMINAL; Thread Quantity Per Inch: 18; Smallest Inside Diameter: 0.425 INCHES NOMINAL IN; Nominal Tube Outside Diameter: 0.375 INCHES IN. 18 total characteristics are documented in the Federal Logistics Information System.
NSN 4730-00-554-7397 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.