SMA (SubMiniature version A) connectors are semi-precision coaxial RF connectors developed in the 1960s as a minimal connector interface for coaxial cable with a screw-type coupling mechanism. The connector has a 50 ohm impedance. An SMA female connector has the threaded connector end and a center pin. The SMA connector employs a 1/4-inch diameter, 36-thread-per-inch threaded barrel. The male is equipped with a hex nut measuring 5/16 inch (0.3125 inch / 7.9 mm) across opposite flats, thus taking the same wrench as a #6 SAE hex nut. SMA connectors are commonly used for antenna applications.

Specifications:

• End 1: BNC Male, Gold Plate connector pin
  
• End 2: SMA Female, Gold Plated Connector
  
• 75 Ohms