Eisenking Products Inc.

Spring-Return Hollow Center Hydraulic Ram Ideal for push/pull applications found in off-highway, construction, mining, and other industries where heavy equipment is maintained. Center hole permits extending screws, cables, etc., straight through the ram for versatility of application. Ram withstands full �dead-end� loads. Chrome-plated piston rods resist wear, and superior packings and seals provide high cycle life without leakage. Piston head inserts are inter-changeable for versatility, and tapped base mounting holes provide easy installation in fixed applications. No. 4139 Cylinder Capacity (tons): 30 Stroke (in.): 2-1/2 Retracted Height (in.): 6-1/4 Extended Height (in.): 8-3/4 Outside Diameter (in.): 4-3/4 Piston Rod Diameter (in.): 3-1/4 Center Hole Diameter (in.): 1-19/64 Inches Between Base Holes: 3-5/8 Insert Thread Size (in.): 2-3/4-12 Collar Thread (in.): 4-3/4-12 Thread Length (in.): 1-1/2 Oil Capacity (cu. in.): 15.85 Int. Pressure at Capacity (cu. in.): 9,457 Tons at 10,000 PSI: 31.7 Base to Inlet Port (in.): 1-5/32 Base Mounting Holes (in.): 7/16-20 Cylinder Effective Area (sq. in.): 6.34