... high efficiency,high accuracy,use frequency,self-locking,long life ball screw jack description:1.Model: RNK-0.5T,1T,2T,3T ... 20T2.Configuration: worm and worm gear,bearing,housing and ball screw3.Ball screw jack assemblies use small balls to roll between the ... 5.Ball screw jack stand loading capacity is 1/3 Lead screw jack loading capacity.6.Ball screw jack is more precision than Lead screw jack7.Ball ...