The Nut,tube Coupling, cataloged under National Stock Number 4730-01-283-9586, 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 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-283-9586 |
| Primary Part Number | MS21921-16K |
| 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 | 0.687 INCHES NOMINAL IN |
| Width Across Flats | 1.500 INCHES NOMINAL IN |
| Thread Series | UNIFIED NATIONAL JOINT (UNJ) |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.312 INCHES IN |
| Specification/standard Data | 96906-MS21921 GOVERNMENT STANDARD |
| Nut Height | 1.047 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 316 OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 1.074 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 1.000 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 |
|---|---|
| MS21921-16K PRIMARY | Sae International Dba Sae International (USA) |
| 137618661 | Leonardo S.p.a. - Electronics Division - Defence Business Area (ITA) |
| Reference | Meaning |
|---|---|
| AS18280 | 5/9 Secondary reference Sae International Dba Sae International |
| SAE-AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
| MS21921-16K | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 5/9 Secondary reference U.S. Government activity |
| MS21921-16K | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-283-9586 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 4730-01-283-9586 has 2 manufacturer part numbers on file: MS21921-16K (Sae International Dba Sae International), 137618661 (Leonardo S.p.a. - Electronics Division - Defence Business Area).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-350-9706. Verify interchangeability with system specifications before substitution.
Key specifications for MS21921-16K: Length to Shoulder: 0.687 INCHES NOMINAL IN; Width Across Flats: 1.500 INCHES NOMINAL IN; Thread Series: UNIFIED NATIONAL JOINT (UNJ); Seat Angle: 45.0 DEGREES NOMINAL. 15 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.