The Locknut,pipe, cataloged under National Stock Number 4730-00-174-0166, 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 12 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-174-0166 |
| Item Name | Locknut,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 6.375 INCHES NOMINAL IN |
| Packing Recess Diameter | 5.563 INCHES NOMINAL IN |
| Thread Series | NPSL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 4.000 INCHES IN |
| Nut Height | 0.900 INCHES NOMINAL IN |
| Surface Treatment | ZINC OVERALL |
| Nut Style | PIPE LOCKNUT |
| Thread Class | 2B |
| Thread Quantity Per Inch | 8 |
| Material | IRON OVERALL |
| Packing Recess Depth | 0.094 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 |
|---|---|
| FIG57 | 5/9 Secondary reference U.S. Government activity |
| WWP471CQQBCN | 2/2 Government specification standardization U.S. Government activity |
| WW-P-471 | 4/1 Identification reference U.S. Government activity |
| NC1909-4 | C/1 Advisory reference — outside the item-of-supply concept Diamond Power International, Inc. |
NSN 4730-00-174-0166 is a Locknut,pipe, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-174-0166: Width Across Flats: 6.375 INCHES NOMINAL IN; Packing Recess Diameter: 5.563 INCHES NOMINAL IN; Thread Series: NPSL; Thread Direction: RIGHT-HAND. 12 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.