As a design alternative to screw-based linear drive systems, the RS4 drive nut provides backlash-free linear motion and simplifies changes to linear pitch. The linear pitch of the nut is factory-set at one of five different linear pitch settings, determined by application requirements. Pitch wedges between the drive bearings hold them at a specific angle relative to shaft. This angle determines the linear pitch. Changing pitch is simply a matter of replacing the pitch wedges with a different set of wedges. Changing the pitch of this nut does not require any other components, machinery or controls, and no changes to system design are needed. Because there are no threads to clog or jam, the nut will not churn in the event of an overload. Instead the nut simply slips until the overload can be corrected. This protects system components and helps prevent costly downtime for system repairs. Axial thrust is measured at up to 500 pounds and repeatable accuracy is to within +/- 0.0004 inches depending on the type of controls used.