... Shaft, Taper Roll Bearings, Seals, Housing, Self-locking Trapezoidal Screw,etc.* Model: RN-0.5ton, RN-1 ton, RN-2 ton ... ,Couplings,Flexible Linking Shaft,Trunnion Base,etc.* Application Industries: Machinery,Metallurgy,Construction, Irrigation,Chemical industry,Health Care,Culture,Health,etc worm screw lift