The Tailpiece,union, cataloged under National Stock Number 4730-01-509-4518, 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 Naval Sea Systems Command. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-509-4518 |
| Primary Part Number | 7326279-1 |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Nominal Pipe Size Designation | 0.750 INCHES IN |
| Flange Thickness | 0.093 INCHES NOMINAL IN |
| End Connection Type | SWEAT SOLDER |
| Criticality Code Justification | FEAT |
| Seat Type | GASKET |
| Tubing Outside Diameter | 0.765 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Material | STEEL CORROSION RESISTING |
| Flange Outside Diameter | 1.875 INCHES NOMINAL IN |
| Working Pressure and Service Type | 6000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL HYDRAULIC OIL LBS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 7326279-1 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7326279 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-509-4518 is a Tailpiece,union, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-509-4518 has 1 manufacturer part number on file: 7326279-1 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-509-4521. Verify interchangeability with system specifications before substitution.
Key specifications for 7326279-1: Nominal Pipe Size Designation: 0.750 INCHES IN; Flange Thickness: 0.093 INCHES NOMINAL IN; End Connection Type: SWEAT SOLDER; Criticality Code Justification: FEAT. 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.
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.