Amphenol 50 Ohm SMA RF Coaxial Revese Polarity Bulkhead Crimp Jacks 50 Ohm SMA RF coaxial revese polarity bulkhead jacks with a crimp termination. These 50 Ohm SMA RF coax reverse polarity panel mount crimp jack connectors have a gold plated centre contact and are suitable for use with a variety of RF coaxial cable types. The panel cut-out for these SMA bulkhead crimp jacks is 6.5 x 6mm.