Series SSMA,also be called OSSM, was designed to a size compatible with smaller diameter semi-rigid cable. The coupling thread is 10-36 UNS thread, which have the characteristics of high frequency bandwidth, light weight and highly reliable mechanical performance. The SSMA series are produced as smaller version of SMA connectors according to the specifications of IEC169-18 and CECC22140. It was widely used in RF and microwave technology. Characteristic impedance 50 Ohm.