Ridgid 1224 Pipe Threading MachineRidgid 1224 Pipe Threading Machine The Model 1224 threads a wide range of pipe including black, galvanized and plastic coated pipe, together with stainless steel, IMC and heavy wall conduit, as well as rod up to 30 Rockwell C. An induction motor helps minimize noise. A special capacitor start capacitor run motor allows the 1224 to thread a full range of material where voltage drop is experienced. 1 4" 2" Universal Die Head; 2 1 2" 4" receding die head