RCY Series Terminal and Tooling. From JST, this range of crimp contact and tooling is for RCY Series wire-to-wire connectors. RCY Wire-to-Wire Connectors Crimp and Tooling includes:. Stock number ; 688-1436 688-1436 is a female crimp contact Stock number ; 688-0883 688-0883 is a Crimp insertion tool Stock number ; 688-0887 688-0887 is a Crimp Tool