The Nut,tube Coupling, cataloged under National Stock Number 4730-00-554-8015, 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 Marshall of Cambridge Aerospace Limited. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4730-00-554-8015 |
| Primary Part Number | MS21921-4 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Marshall of Cambridge Aerospace Limited |
| Status | CANCELLED |
| Nut Height | 0.720 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Length to Shoulder | 0.537 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN |
| Width Across Flats | 0.562 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.250 INCHES IN |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Material | STEEL OVERALL |
| Nominal Thread Size | 0.438 INCHES IN |
| Thread Quantity Per Inch | 20 |
| Smallest Inside Diameter | 0.300 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Thread Class | 3B |
| Thread Direction | RIGHT-HAND |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS21921-4 | Marshall of Cambridge Aerospace Limited (GBR) |
| 4730-554-8015 | E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
| 4730005548015 | E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
| MS21921-4 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS21921D4 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| AP2109T04 | Sps Technologies, Llc Dba Airdrome Precision Components (USA) |
| AP2109T4 | Sps Technologies, Llc Dba Airdrome Precision Components (USA) |
NSN 4730-00-554-8015 is a Nut,tube Coupling, manufactured by Marshall of Cambridge Aerospace Limited, classified under FSC 4730 (No Item Name Available). Status: cancelled.
NSN 4730-00-554-8015 has 7 cross-referenced part numbers: MS21921-4 (Marshall of Cambridge Aerospace Limited), 4730-554-8015 (E.c.a Etablissement Centrald'approvisionnement Des Forces Armee), 4730005548015 (E.c.a Etablissement Centrald'approvisionnement Des Forces Armee), MS21921-4 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS21921D4 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M) and 2 more.
There are 2 known substitutes for 4730-00-554-8015: 4730-00-222-8636, 4730-00-555-8203. Verify interchangeability with system specifications before substitution.
Key specifications for MS21921-4: Nut Height: 0.720 INCHES NOMINAL IN; Nut Style: TUBE COUPLING; Length to Shoulder: 0.537 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN; Width Across Flats: 0.562 INCHES NOMINAL IN. 14 total characteristics are documented in the Federal Logistics Information System.
NSN 4730-00-554-8015 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.