Insulated, rigid, Ø 4 mm, accepting spring-loaded Ø 4 mm plugs with rigid insulating sleeve. Machined brass. The socket is surface-mounted, assembled flush, or pressed into pre-drilled panels of plastic, metal, etc.
Connection: Threaded bolt M4.
Optional: Protective cap SD-XUB to cover up unplugged, unused sockets (Protection degree IP67).