The Nut,tube Coupling, cataloged under National Stock Number 4730-00-781-9235, 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 Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-781-9235 |
| Primary Part Number | 305-480224-3 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing |
| Status | ACTIVE |
| Length to Shoulder | 0.325 INCHES NOMINAL IN |
| Width Across Flats | 2.531 INCHES NOMINAL IN |
| Largest Outside Diameter | 3.400 INCHES NOMINAL IN |
| Thread Series | UN |
| Material Document and Classification | QQ-A-225/2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Seat Angle | 0.90 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.250 INCHES IN |
| Nut Height | 0.625 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | ALUMINUM ALLOY 3003 OVERALL |
| Fabrication Method | CAST |
| Smallest Inside Diameter | 2.400 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 1.750 INCHES 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 |
|---|---|
| 305-480224-3 | Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 305-480224-3 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4730-00-781-9235 is a Nut,tube Coupling, manufactured by Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-781-9235 has 1 manufacturer part number on file: 305-480224-3 (Mercer Products & Manufacturing Company Dba Mercer Products & Manufacturing Co Div Mercer Products & Manufacturing).
Key specifications for 305-480224-3: Length to Shoulder: 0.325 INCHES NOMINAL IN; Width Across Flats: 2.531 INCHES NOMINAL IN; Largest Outside Diameter: 3.400 INCHES NOMINAL IN; Thread Series: UN. 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.