The Locknut,tube Fitting, cataloged under National Stock Number 4730-00-833-7656, 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 13 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-833-7656 |
| Primary Part Number | AS5179K20 |
| Item Name | Locknut,tube Fitting |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Width Across Flats | 1.922 INCHES MINIMUM AND 1.954 INCHES MAXIMUM IN |
| Packing Recess Diameter | 1.849 INCHES MINIMUM AND 1.859 INCHES MAXIMUM IN |
| Thread Series | UN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.625 INCHES IN |
| Nut Height | 0.438 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Nut Style | TUBE FITTING LOCKNUT |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Nominal Tube Outside Diameter | 1.250 INCHES IN |
| Packing Recess Depth | 0.049 INCHES MINIMUM AND 0.059 INCHES MAXIMUM 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 |
|---|---|
| AS5179K20 PRIMARY | Sae International Dba Sae International (USA) |
| 157618230 | Leonardo S.p.a. - Electronics Division - Defence Business Area (ITA) |
| Reference | Meaning |
|---|---|
| SAE-AS4841 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AN6289K20 | 5/9 Secondary reference U.S. Government activity |
| 4730PL2094303 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| SAE AS54841 | 5/9 Secondary reference Sae International Dba Sae International |
| SAE AS54841 | 5/9 Secondary reference U.S. Government activity |
| SAE AS5179 | 5/9 Secondary reference U.S. Government activity |
| SAE AS5179 | 5/9 Secondary reference Sae International Dba Sae International |
NSN 4730-00-833-7656 is a Locknut,tube Fitting, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-833-7656 has 2 manufacturer part numbers on file: AS5179K20 (Sae International Dba Sae International), 157618230 (Leonardo S.p.a. - Electronics Division - Defence Business Area).
3 possible matches (shared part number, not a government interchangeability claim): 4730-00-929-5410, 4730-01-286-1958, 4730-01-698-4928. Verify interchangeability with system specifications before substitution.
Key specifications for AS5179K20: Width Across Flats: 1.922 INCHES MINIMUM AND 1.954 INCHES MAXIMUM IN; Packing Recess Diameter: 1.849 INCHES MINIMUM AND 1.859 INCHES MAXIMUM IN; Thread Series: UN; Thread Direction: RIGHT-HAND. 13 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.