The Thread Piece,union, cataloged under National Stock Number 4730-01-521-0507, 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 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-521-0507 |
| Primary Part Number | 6393629 FIND 009 |
| Item Name | Thread Piece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Union End Thread Direction | RIGHT-HAND |
| End Connection Type | WELDED |
| Criticality Code Justification | FEAT |
| Union End Thread Size | 13/16-16 |
| Seat Type | RECESSED FACE |
| Tubing Outside Diameter | 0.500 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Union End Screw Thread Series Designator | UN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 6393629 FIND 009 | Naval Sea Systems Command (USA) |
| 6394975 FIND 012 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| H849T-8-SS | 3/2 Design control — primary reference U.S. Government activity |
| 6394975 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-521-0507 is a Thread Piece,union, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-521-0507 has 2 manufacturer part numbers on file: 6393629 FIND 009 (Naval Sea Systems Command), 6394975 FIND 012 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-521-0834. Verify interchangeability with system specifications before substitution.
Key specifications for 6393629 FIND 009: Union End Thread Direction: RIGHT-HAND; End Connection Type: WELDED; Criticality Code Justification: FEAT; Union End Thread Size: 13/16-16. 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.