The Locknut,tube Fitting, cataloged under National Stock Number 4730-01-389-0400, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-389-0400 |
| Item Name | Locknut,tube Fitting |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 0.563 INCHES NOMINAL IN |
| Packing Recess Diameter | 0.483 INCHES NOMINAL IN |
| Hole Thread Quantity Per Inch | 24 |
| Surface Treatment Document and Classification | MIL-F-5509 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.313 INCHES IN |
| Nut Height | 0.250 INCHES NOMINAL IN |
| Nut Style | TUBE FITTING LOCKNUT |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 316 OVERALL |
| Fabrication Method | MACHINED |
| Nominal Tube Outside Diameter | 0.125 INCHES IN |
| Packing Recess Depth | 0.037 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 |
| Reference | Meaning |
|---|---|
| AN6289K2 | 2/2 Government specification standardization U.S. Government activity |
| MIL-F-5509 | 4/1 Identification reference U.S. Government activity |
NSN 4730-01-389-0400 is a Locknut,tube Fitting, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-389-0400: Width Across Flats: 0.563 INCHES NOMINAL IN; Packing Recess Diameter: 0.483 INCHES NOMINAL IN; Hole Thread Quantity Per Inch: 24; Surface Treatment Document and Classification: MIL-F-5509 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.