... and lead screw3.Function: Elevating, Lowering, Pulling, Pressing, Pushing,Rotating4.Power Source: Manually or Electrically5.Characteristic: Positioning precision,Safely self-locking,Heavy ... wheel,reducers,rubber Bellows,steel cover,bevel gearbox,Safety nut,frequency-inverter,brake,trunnion base,limit switches,coupling,link shafting.8 ...