The Nut,tube Coupling, cataloged under National Stock Number 4730-00-555-8204, 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 8 commercial cross-references from 6 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 | 4730-00-555-8204 |
| Primary Part Number | MS21921-10D |
| 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 | CANCELLED |
| Thread Direction | RIGHT-HAND |
| Material | ALUMINUM ALLOY OVERALL |
| Surface Treatment | ANODIZE OVERALL |
| Surface Treatment Document and Classification | MIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.625 INCHES IN |
| Thread Series | UNF |
| Nominal Thread Size | 0.875 INCHES IN |
| Smallest Inside Diameter | 0.690 INCHES MINIMUM AND 0.695 INCHES MAXIMUM IN |
| Nut Height | 0.970 INCHES MINIMUM AND 0.990 INCHES MAXIMUM IN |
| Thread Quantity Per Inch | 14 |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Nut Style | TUBE COUPLING |
| Length to Shoulder | 0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN |
| Thread Class | 3B |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS21921-10D | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| C61A2024D10 | Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters (USA) |
| SAE-AS18280 | Sae International Dba Sae International (USA) |
| 156/9 | Wellman Group (GBR) |
| MS21921D10 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| C61A2024D10 | Parker Hannifin Corporation Div Aerospace Group Headquarters (USA) |
| C61A2024D10 | Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn (USA) |
| MS21917D10 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
NSN 4730-00-555-8204 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: cancelled.
NSN 4730-00-555-8204 has 8 cross-referenced part numbers: MS21921-10D (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), C61A2024D10 (Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters), SAE-AS18280 (Sae International Dba Sae International), 156/9 (Wellman Group), MS21921D10 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M) and 3 more.
There are 12 known substitutes for 4730-00-555-8204: 5365-00-089-4451, 5310-00-297-5893, 2940-00-350-9071 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for MS21921-10D: Thread Direction: RIGHT-HAND; Material: ALUMINUM ALLOY OVERALL; Surface Treatment: ANODIZE OVERALL; Surface Treatment Document and Classification: MIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 16 total characteristics are documented in the Federal Logistics Information System.
NSN 4730-00-555-8204 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.