HCM Connectors JST Automotive HCM Connectors are 2.54mm pitch wire-to-wire and wire-to-board connectors designed with automotive safety requirements in mind. This HCM Series incorporates a secondary lock feature. This feature not only ensures correct connector assembly but also facilitates connector strength and durability. JST Automotive HCM Connectors are suitable for automotive applications such as display, ECU, relay, and other small electrical units.