The Nut,union, cataloged under National Stock Number 4730-01-186-8640, 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 13 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-01-186-8640 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 1.770 INCHES NOMINAL IN |
| Shoulder Step Width | 0.135 INCHES NOMINAL IN |
| Shoulder Width | 0.125 INCHES NOMINAL IN |
| Thread Series | UN |
| Thread Pitch Diameters | +1.3834 TO 1.3910 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.438 INCHES IN |
| Nut Height | 0.755 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Quantity Per Inch | 12 |
| Material | COPPER ALLOY OVERALL |
| Smallest Inside Diameter | 1.215 INCHES NOMINAL IN |
| Shoulder Seat Diameter | 1.380 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 |
|---|---|
| 213559 ITEM 16 | 5/9 Secondary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
| 0085368 | 3/9 Design control — primary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
NSN 4730-01-186-8640 is a Nut,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-186-8640: Width Across Flats: 1.770 INCHES NOMINAL IN; Shoulder Step Width: 0.135 INCHES NOMINAL IN; Shoulder Width: 0.125 INCHES NOMINAL IN; Thread Series: UN. 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.