... accuracy,use frequency,self-locking,long life ball screw jack description:1.Model: RNK-0.5T,1T,2T ... gear,bearing,housing and ball screw3.Ball screw jack assemblies use small balls to roll between the ... less friction than lead screw jack and increase use life.4.Ball screw jack is more suitable to ... capacity is 1/3 Lead screw jack loading capacity.6.Ball screw jack is more precision than Lead screw ...