... Shaft, Coupling, Pillow Block Bearing, Counter, Bevel Gearbox, Swivel Plate and Trunnion Base Worm Gear Bevel Gear Screw Jack Features:* Lifting ... Top End: Top Plate,Clevis End,Threaded End,Plain End and Forked Head.* Lifting, Lowering, Pushing, Pulling and Rolling Linear Motions.* ... : alloy steel,case hardened,be of high rigidity and wear risistance.Worm Gear Bevel Gear Screw Jack Certificates: