1. Alat threading pikeun machining atawa koréksi threads éksternal.
2. Ieu sarua jeung nut kalawan karasa tinggi, tur aya sababaraha liang panyabutan chip sabudeureun liang screw, sarta motong congcot umumna taneuh di duanana tungtung liang screw.
3. paeh normal dibagi kana pitch kasar jeung pitch rupa, nu bisa ngolah threads éksternal biasa kalawan zone kasabaran 6g.