The Locknut,tube Fitting, cataloged under National Stock Number 4730-01-133-1590, 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 The Boeing Company Div Defense. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-133-1590 |
| Primary Part Number | 74B580173-101 |
| Item Name | Locknut,tube Fitting |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Width Across Flats | 3.350 INCHES NOMINAL IN |
| Packing Recess Diameter | 2.580 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNIFIED NATIONAL JOINT (UNJ) |
| Material Document and Classification | QQ-A-225,COND T851 FED SPEC SINGLE MATERIAL RESPONSE NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.500 INCHES IN |
| Nut Height | 0.500 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE NUT |
| Nut Style | TUBE FITTING LOCKNUT |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | ALUMINUM ALLOY NUT |
| Material | PLASTIC LOCKING INSERT |
| Nominal Tube Outside Diameter | 2.000 INCHES IN |
| Packing Recess Depth | 0.090 INCHES NOMINAL 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 |
|---|---|
| 74B580173-101 PRIMARY | The Boeing Company Div Defense (USA) |
| 74B580173-101 | The Boeing Company Div Services (USA) |
| 74B580173-101 | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| Reference | Meaning |
|---|---|
| LS580173 | 5/9 Secondary reference Long-Lok, Llc |
| 74B580173 | D/9 Drawing number reference only The Boeing Company Div Defense |
| 10108710 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| LS580173-101 | 5/9 Secondary reference Long-Lok, Llc |
NSN 4730-01-133-1590 is a Locknut,tube Fitting, manufactured by The Boeing Company Div Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-133-1590 has 3 manufacturer part numbers on file: 74B580173-101 (The Boeing Company Div Defense), 74B580173-101 (The Boeing Company Div Services), 74B580173-101 (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems).
Key specifications for 74B580173-101: Width Across Flats: 3.350 INCHES NOMINAL IN; Packing Recess Diameter: 2.580 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE NUT; Thread Series: UNIFIED NATIONAL JOINT (UNJ). 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.