UHF connectors are sometimes also called Ampheno coaxial connectors. They were designed by Ampheno's designers in the 1930s and used as RF connectors in the radio industry. UHF connectors were originally intended to be video connectors for radar equipment, but later were used in various RF applications. The plug can be called a PL259 coaxial connector, while the socket can be called an SO239 connector. These are their original military part numbers.
RF Coaxial Connector BNC Female UHF SO239 Female High Frequency BNC to UHF Adapter 
Overview
RF coaxial adaptor has high reliability, strong vibration resistance, mechanical and electrical characteristics of excellent performance. It is widely used in vibration and environment under the condition of radio equipment and instrument , ground launch system, and it can join all kinds of coaxial cables.
Electrical Characteristics
| Name |
BNC Female to SO239 Female Adapter |
|
Impedance |
50Ω |
|
Frequency range |
0~6GHz |
|
Working Voltage |
2700V max |
|
Withstand Voltage |
4000V rms |
|
VSWR Straight Rigth Angle |
≤ 1.2 ≤ 1.3 |
|
Contact resistance -center contact -outer contact |
≤5mΩ ≤5mΩ |
|
Insulation resistance |
≥10000MΩ |
|
Temperature range |
-55°C~+155°C |
|
Durability(matings) |
>500 |
Construction
|
Piece part |
Material |
plating |
|
Body |
Brass |
Nickel plated |
|
Center conductor |
Brass or Phosphor Bronze |
Gold or silver plated |
|
Crimping suite |
Copper alloy |
Nickel plated |
|
O-ring sealing |
6146 silastic |
|
|
Insulator |
PTFE |
