The SMC is similar in design to the SMB, except it has threaded coupling interface, instead of a snap-on interface. These screw on designs operate reliably to 10 GHz at a 50 ohm impedance. SMC types have a 10-32 UNF threaded coupling. This is a good choice for applications where the need for small size and performance in high vibration environments are a concern, To reduce the difficulties of assembly inherent in this type of connector, the polarized centre contacts are tape mounted for easy assembly and termination.