... worm gear,bearing,housing and ball screw3.Ball screw jack assemblies use small balls to roll between the nut ... Wheel, Inverter, Limited Switches, Linking Shaft, Coupling, Pillow Block Bearing, Counter, Bevel Gearbox, Swivel Plate and Trunnion Base. ... Available.* Anti-backlash Nut Device Available.* Special Custom Design Available.Materials: * Lifting Screw: steel C45 (optional: stainless steel)* Worm ...