The X4 looks like a conventional rack and pinion actuator but it drives its shaft incrementally in unidirectional steps to hard stops. The steps are accurate within +/- 0.2 degree, and error does not accumulate. The X4 is our largest single rack indexing actuator, delivering almost 3.5 inch-pounds of torque per psi of working pressure. This unique device indexes with very high accuracy and no accumulating error. It is ideal for use in medium to large index tables, conveyors, or to consistently position parts evenly for multiple simultaneous operations. The X4 is rugged, fast, simple to operate, and very reliable.