The A51-451-0000220 is a micro-miniature rapid connect/disconnect RF Coaxial Connector with brass body and gold plated beryllium copper contacts. This SSMB coaxial printed circuit receptacle straight jack connector is quick disconnect version of the SSMC and is used in applications where limited space prohibits the use of torque wrenches or when components or modules must be quickly changed to keep down time to a minimum.