... ZBJ19004 external involute helical cylindrical gear reducer. This product is widely used in metallurgy, mining, lifting, transportation, cement, construction, ... quenching, tooth surface hardness of HRC58-62, CNC gear grinding processes are used, high accuracy and good touch ... ZDY single-stage gear reducer, ZLY two-stage gear reducer, ZSY 3 gear reducer, ZFY four cylinder gear reducer.2. Specifications ...