The Nut,union, cataloged under National Stock Number 4730-01-377-7043, 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13 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-377-7043 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 2.406 INCHES NOMINAL IN |
| Shoulder Step Width | 0.172 INCHES NOMINAL IN |
| Thread Series | UN |
| Maximum Working Pressure Rating and Service for Which Designed | 700.0 POUNDS PER SQUARE INCH (PSI) WATER LBS |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.125 INCHES IN |
| Nut Height | 0.781 INCHES NOMINAL IN |
| Countersink Angle | 45.0 DEGREES NOMINAL OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | NICKEL ALLOY OVERALL |
| Smallest Inside Diameter | 1.637 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 |
|---|---|
| 803-2177934 | D/9 Drawing number reference only U.S. Government activity |
| 803-2177934-X4XX-04 | 3/2 Design control — primary reference U.S. Government activity |
| 803-2177934-X4X | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 4730-01-377-7043 is a Nut,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-377-7043: Width Across Flats: 2.406 INCHES NOMINAL IN; Shoulder Step Width: 0.172 INCHES NOMINAL IN; Thread Series: UN; Maximum Working Pressure Rating and Service for Which Designed: 700.0 POUNDS PER SQUARE INCH (PSI) WATER LBS. 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.