The Tailpiece,union, cataloged under National Stock Number 4730-01-139-4501, 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 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-01-139-4501 |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Nominal Pipe Size Designation | 0.250 INCHES IN |
| Strength Rating | ERR-060 |
| Flange Thickness | 0.312 INCHES NOMINAL IN |
| End Connection Type | WELDED |
| Seat Type | GASKET |
| Surface Treatment | PASSIVATE |
| Seat Material | STEEL COMP 304 |
| Material | STEEL COMP 304 |
| Flange Outside Diameter | 1.625 INCHES NOMINAL IN |
| Working Pressure and Service Type | 4500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL AIR AND 4500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL WATER LBS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2621-791-0/ASSY66 | 3/2 Design control — primary reference U.S. Government activity |
| 2621-791-01 | D/9 Drawing number reference only U.S. Government activity |
NSN 4730-01-139-4501 is a Tailpiece,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-139-4501: Nominal Pipe Size Designation: 0.250 INCHES IN; Strength Rating: ERR-060; Flange Thickness: 0.312 INCHES NOMINAL IN; End Connection Type: WELDED. 10 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.
NSN 4730-01-139-4501 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.