Hellermanntyton brass conduit connector sc sm series hellermann tyton 166 30403 the hellermanntyton 166 30403 sc16 sm m20 is a brass connector for metallic conduit from the sc sm series the connector has a swivel external m20 thread and comprises of two parts the shell and the body the connectors have been nickel plated hellermanntyton 166 30403 sc16 sm m20 brass conduit connector m20 13mm