30 Ton 6″ Stroke Hydraulic Cylinder Lifting Jack Ram 10″ Closed Height Lock Nut. 30 Ton 6″ Stroke Hydraulic Cylinder Lifting Jack Ram 10″. Cylinder Capacity: 30 Ton. Closed Height : 10 (250mm). Equipment With Lock Nut. Unit Dim L x W x H (in). 5-3/4 x 5-3/4 x 9-3/4 Estimated.