Hellermanntyton straight cable conduit fitting brass nickel plated sc fm hellermann tyton 166 30303 the hellermanntyton 166 30303 sc16 fm m20 is a brass connector for metallic conduit from the sc fm series the connector has a swivel external m20 thread and comprises of two parts the shell and the body the connector has been manufactured from nickel plated brass hellermanntyton 166 30303 sc16 fm m20 helaguard metallic conduit screw fitting