Hellermanntyton straight cable conduit fitting brass nickel plated sc fm hellermann tyton 166 30305 the hellermanntyton 166 30305 sc25 fm m25 is a brass connector for metallic conduit from the sc fm series the connector has a swivel external m25 thread and comprises of two parts the shell and the body the connector has been manufactured from nickel plated brass hellermanntyton 166 30305 sc25 fm m25 helaguard metallic conduit screw fitting