The Nut,union, cataloged under National Stock Number 4730-01-422-7256, 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 14 specifications, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-422-7256 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 1.588 INCHES NOMINAL IN |
| Shoulder Step Width | 0.250 INCHES NOMINAL IN |
| Shoulder Width | 0.188 INCHES NOMINAL IN |
| Thread Series | NPT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Specification/standard Data | 81349-MIL-V-24630/1A GOVERNMENT SPECIFICATION A |
| Nondefinitive Spec/std Data | 3 FIGURE |
| Nut Height | 1.000 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Quantity Per Inch | 18 |
| Material | NICKEL ALLOY OVERALL |
| Smallest Inside Diameter | 0.878 INCHES NOMINAL IN |
| Shoulder Seat Diameter | 1.201 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 |
|---|---|
| MIL-DTL-24630/1 | 4/1 Identification reference U.S. Government activity |
| PLC-11440 | D/9 Drawing number reference only U.S. Government activity |
| 085061AE | 5/1 Secondary reference U.S. Government activity |
| MIL-V-24630/1A | 5/9 Secondary reference U.S. Government activity |
| MIL-V-24630/1-0 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| PLC-11440-3/.250IPS | 5/1 Secondary reference U.S. Government activity |
| M24630/1-04N | 2/2 Government specification standardization U.S. Government activity |
| M24630/1A-04N | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-422-7256 is a Nut,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-422-9570. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-422-7256: Width Across Flats: 1.588 INCHES NOMINAL IN; Shoulder Step Width: 0.250 INCHES NOMINAL IN; Shoulder Width: 0.188 INCHES NOMINAL IN; Thread Series: NPT. 14 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.