The Thread Piece,union, cataloged under National Stock Number 4730-00-540-4149, 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 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 13 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 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 | 4730-00-540-4149 |
| Primary Part Number | 753520 |
| Item Name | Thread Piece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Union End Thread Direction | RIGHT-HAND |
| Strength Rating | ERR-060 |
| End Connection Type | THREADED |
| Union End Thread Size | 3/4IN-16 IN |
| Seat Type | BALL |
| Thread Direction | RIGHT-HAND |
| Seat Radius | 0.625 INCHES NOMINAL IN |
| Thread Size | 3/4-16 |
| Screw Thread Series Designator | UNF |
| Surface Treatment | PASSIVATE |
| Union End Screw Thread Series Designator | UNF |
| Screw Thread Location | EXTERNAL |
| Material | STEEL COMP 302 |
| 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 |
|---|---|
| 753520 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
NSN 4730-00-540-4149 is a Thread Piece,union, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-540-4149 has 1 manufacturer part number on file: 753520 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
1 possible match (shared part number, not a government interchangeability claim): 5342-01-542-4213. Verify interchangeability with system specifications before substitution.
Key specifications for 753520: Union End Thread Direction: RIGHT-HAND; Strength Rating: ERR-060; End Connection Type: THREADED; Union End Thread Size: 3/4IN-16 IN. 13 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.