Cannon's MIKM Microminiature Circular Connector is designed with a steel shell and receptacle for improved ruggedness and RFI resistance. It accommodates up to 55 contacts on .050 (1.27) centers (equivalent to 420 contacts per square inch) and features 5 keyway polarization to prevent cross plugging. The threaded coupling nuts offer strong, reliable coupling. MIKM receptacles can be either front or back panel mounted; in back mounting applications, panel thickness of up to 3/32" can be used on the larger sizes. Maximum temperature range - 55°C to + 125°C.