The Nut,tube Coupling, cataloged under National Stock Number 4730-00-554-8020, 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 17 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-554-8020 |
| Primary Part Number | MS21921-16 |
| 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 | 0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN |
| Width Across Flats | 1.500 INCHES NOMINAL IN |
| Thread Series | UN |
| Material Document and Classification | MIL-S-13433,TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.312 INCHES IN |
| Specification/standard Data | 96906-MS21921 GOVERNMENT STANDARD |
| Nut Height | 1.040 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 1.074 INCHES MINIMUM AND 1.079 INCHES MAXIMUM 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 |
|---|---|
| MS21921-16 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| MS21921-16 | 5/9 Secondary reference U.S. Government activity |
| MS21921-16 | 5/9 Secondary reference U.S. Government activity |
| AP2109T16 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba Airdrome Precision Components |
| AS21921 | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
| 202-21600W16 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| AS18280 | 5/9 Secondary reference U.S. Government activity |
| AS21921 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 4730-00-554-8020 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 4730-00-554-8020 has 1 manufacturer part number on file: MS21921-16 (Sae International Dba Sae International).
Key specifications for MS21921-16: Length to Shoulder: 0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN; Width Across Flats: 1.500 INCHES NOMINAL IN; Thread Series: UN; Material Document and Classification: MIL-S-13433,TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 17 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.