Center-Hole, Power Twin® Ram Use this ram on Grip-O-Matic® pullers, Push-Pullers, and shop presses. OTC�s center-hole ram is ideal for jobs that require a great deal of force and a relatively short stroke. Compared to the force it develops, the center-hole Power Twin ram is light-weight, compact, and easy to handle, permitting its use in confined quarters. Center-hole feature permits extending jacking screws, cables, puller screws, etc., straight through the ram.

• Quick Change Inserts For added job versatility, the Power Twin ram also features a basic head which allows the operator to change from a tapped hole to a plain hole by merely changing the head insert (held in place by a socket-head set screw). In certain applications, the use of a plain insert is desired, since it permits using a speed nut for necessary readjustment after the ram has been extended,rather than turning the screw with a speed crank. No. 4121 � 30-ton Power Twin single-acting hydraulic ram. Complete with No. 21873 threaded ram head insert, ram attaching screws, and No. 9796 ram half coupler. Specifications OTC No. 4121 Capacity (tons)Push: 30, Pull: � Stroke: 2-1/2" Oil Capacity (cu. in.): 15.7 Effective Area (sq. in.): 6.28 Internal PSI at Capacity: 10,000