... according to national professional standards ZBJ19004 external involute helical cylindrical gear reducer. This product is widely used in metallurgy, ... : ZDY single-stage gear reducer, ZLY two-stage gear reducer, ZSY 3 gear reducer, ZFY four cylinder gear reducer.2. Specifications ... ZFY500.ZFY560.ZFY630.ZFY710.ZFY800We produce gearbox, Hardened cylindrical gear reducer , gears, shafts, etc. Hardened ...