Precision linear shafts guide bearings and slides in single-axis motion and positioning applications such as pick-and-place systems, computerized numerical control (CNC) lasers and routers, and machine tooling. Linear motion shafts are machined, cylindrical-shaped components with tight diameter tolerances and smooth finishes. Linear support rails and shafts stop rotational and axial movement, prevent shaft sagging during higher loads, and increase the rigidity of assemblies. End support blocks for linear shafts securely support and accurately locate shafts with rigid mounting points. Ball spline linear shafts have machined arc-shaped grooves along the shaft's length that guide recirculating ball bearings. Linear square shafting mounts in any orientation and will maintain high load capacity while resisting rotation and twist. Linear square shafting accessories enhance the support and mounting capabilities of square shafting.