The Nut,union, cataloged under National Stock Number 4730-00-277-3349, 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15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-277-3349 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 1.500 INCHES NOMINAL IN |
| Shoulder Step Width | 0.219 INCHES NOMINAL IN |
| Shoulder Width | 0.438 INCHES NOMINAL IN |
| Thread Series | UN |
| Maximum Working Pressure Rating and Service for Which Designed | 3000.0 POUNDS PER SQUARE INCH (PSI) OIL AND 3000.0 POUNDS PER SQUARE INCH (PSI) WATER AND 3000.0 POUNDS PER SQUARE INCH (PSI) AIR LBS |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.125 INCHES IN |
| Nut Height | 1.406 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | NICKEL OVERALL |
| Smallest Inside Diameter | 0.672 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY THD SIZE |
| Shoulder Seat Diameter | 1.000 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 |
|---|---|
| 5000S4823-841337PC4 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4730-00-277-3349 is a Nut,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-277-3349: Width Across Flats: 1.500 INCHES NOMINAL IN; Shoulder Step Width: 0.219 INCHES NOMINAL IN; Shoulder Width: 0.438 INCHES NOMINAL IN; Thread Series: UN. 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.