... ,1T,2T,3T,5T,10T,15T,20T 1.Model: RNK-0.5T,1T,2T,3T,5T,10T,15T,20T2.Configuration: worm ... Speed: 75 mm/min ~1800 mm/min9.Ball screw jack assemblies use small balls to roll between the nut ... friction than worm gear screw jack and increase use life.10.Ball screw jack is more suitable to mechanical ... frequently lifting and precise positioning.11.Ball screw jack stand loading capacity is 1/3 worm gear screw ...