... dynamic load 26 ton Self-lock trapezoidal screw worm gear screw jack traveling screw detailed informations:1.Model:RN-0. ... ,pushing,pulling and rolling movements3.Self locking trapezoidal screw,heavy duty,precision accuracy,low efficiency,use infrequently4.Arrangement ... gate in hydroelectric dam,Powered straighteners,Precision levelers,Solar tracking jack systems,Large satellite dish antenna movements, ...