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
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