The Tailpiece,union, cataloged under National Stock Number 4730-01-526-1063, 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 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-526-1063 |
| Primary Part Number | 6393091-1 |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Union Outside Diameter | 3.000 INCHES NOMINAL IN |
| Criticality Code Justification | FEAT |
| Surface Treatment | PASSIVATE |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 6393091-1 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6390641-04 FIND 014 | 5/1 Secondary reference Naval Sea Systems Command |
| 6390641-03 FIND 014 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4730-01-526-1063 is a Tailpiece,union, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-526-1063 has 1 manufacturer part number on file: 6393091-1 (Naval Sea Systems Command).
Key specifications for 6393091-1: Union Outside Diameter: 3.000 INCHES NOMINAL IN; Criticality Code Justification: FEAT; Overall Length: 1.630 INCHES NOMINAL IN; Special Features: WEAPON SYSTEM ESSENTIAL; THRU PASSAGE .25 INCH; UNION END HAS SOCKET FOR .5 INCH PIPE; SECOND END EXTERNAL NONTHREADED WITH TWO GROOVES FOR O'RINGS OR SOLDER RINGS; UNION NUT NOT INCLUDED IN. 4 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.