Screw Jack: 1. housing material:EN1706-AB-AISI10MG T6 and EN 1561- ... 2.flexible usage 3.the maximum lifting force:200ton SJ series Screw Jack advantages:model:SJ5,SJ10,SJ25,SJ50,SJ80,SJ200.size ... and various adjusting height positions. it is a kind of jack-up part having compact structure, small, light, extensive power source ...