... Configuration: worm shaft,worm gear,ball bearing,oil seal,housing and ball screw 1.Model: RNK-0 ... .5T,1T,2T,3T,5T,10T,15T,20T2.Configuration: worm shaft,worm gear,ball ... bearing,oil seal,housing and ball screw3.Static loading: 0.5T ... small balls to roll between the nut and lifting ball screw. This creates significantly less friction ...