The Nut,union, cataloged under National Stock Number 4730-01-203-8702, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Epd. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-203-8702 |
| Primary Part Number | SL-4234 PIECE 53 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| Status | ACTIVE |
| Shoulder Step Width | 0.438 INCHES NOMINAL IN |
| Shoulder Width | 0.188 INCHES NOMINAL IN |
| Thread Series | UNS |
| Hole Configuration Style | CONFIGURATION F |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.125 INCHES IN |
| Nut Diameter | 2.500 INCHES NOMINAL IN |
| Nut Height | 1.250 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.312 INCHES NOMINAL IN |
| Nut Style | ROUND |
| Thread Class | 2B |
| Thread Quantity Per Inch | 10 |
| Material | STEEL OVERALL |
| Smallest Inside Diameter | 2.031 INCHES NOMINAL IN |
| Hole Type and Quantity | 3 DRILLED |
| Shoulder Seat Diameter | 2.188 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 |
| Part Number | Manufacturer |
|---|---|
| SL-4234 PIECE 53 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| Reference | Meaning |
|---|---|
| SL-4234 PIECE 53 | 3/9 Design control — primary reference U.S. Government activity |
| SL-4234 | D/9 Drawing number reference only U.S. Government activity |
| 4666P | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4730-01-203-8702 is a Nut,union, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Epd, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-203-8702 has 1 manufacturer part number on file: SL-4234 PIECE 53 (Curtiss-Wright Electro-Mechanical Corporation Div Epd).
Key specifications for SL-4234 PIECE 53: Shoulder Step Width: 0.438 INCHES NOMINAL IN; Shoulder Width: 0.188 INCHES NOMINAL IN; Thread Series: UNS; Hole Configuration Style: CONFIGURATION F. 16 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.