Hellermanntyton fittings for metallic conduit and metallic overbraid scsb fm hellermann tyton 166 34604 the hellermanntyton 166 34604 scsb12 is a metallic conduit connector with a fixed external thread from the scsb fm series the fitting comprises of two parts the shell and the body the m25 connector has been manufactured from nickel plated brass hellermanntyton 166 34604 scsb25 fm m25 conduit fitting m25 211mm