The Nut,tube Coupling, cataloged under National Stock Number 4730-00-451-2716, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-451-2716 |
| Primary Part Number | MS21921-3W |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Length to Shoulder | 0.429 INCHES NOMINAL IN |
| Width Across Flats | 0.438 INCHES NOMINAL IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Material Document and Classification | QQ-A-367,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Specification/standard Data | 96906-MS21921 GOVERNMENT STANDARD |
| Nut Height | 0.578 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | ALUMINUM ALLOY 7075 OVERALL |
| Smallest Inside Diameter | 0.232 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.188 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MS21921-3W PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| SAE-AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AS21921 | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 5/9 Secondary reference Sae International Dba Sae International |
| AS18280 | 5/9 Secondary reference U.S. Government activity |
| MS21921-3W | 5/9 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| MS21921-3W | 5/9 Secondary reference U.S. Government activity |
| MS21921-3W | 5/9 Secondary reference U.S. Government activity |
| AS21921 | 5/9 Secondary reference Sae International Dba Sae International |
NSN 4730-00-451-2716 is a Nut,tube Coupling, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-451-2716 has 1 manufacturer part number on file: MS21921-3W (Sae International Dba Sae International).
Key specifications for MS21921-3W: Length to Shoulder: 0.429 INCHES NOMINAL IN; Width Across Flats: 0.438 INCHES NOMINAL IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Material Document and Classification: QQ-A-367,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 16 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.