Linear bearings have cylindrical or square-shaped inner surfaces that fit around linear shafts to facilitate motion. Typical uses include motion control systems, automation machinery, robotics, and material handling equipment. Linear plain and sleeve bearings have no moving parts and are self-lubricating. Pillow block linear plain bearings have housings that add stability and mount bearings parallel to surfaces with no moving internal elements. Flange-mount linear plain bearings have surfaces that serve as thrust washers and mount bearings perpendicular to the surface with no moving internal elements. Linear ball bearings have moving elements that operate with low friction and high precision. Pillow block linear ball bearings have housings that add stability and mount bearings parallel to surfaces with low-friction, high-precision internal moving elements. Flange-mount linear ball bearings have mounting surfaces that serve as thrust washers and mount bearings perpendicular to the surface with low-friction, high-precision internal moving elements. Round-shaft linear roller pillow blocks roll smoothly along horizontal round shafts with long travel at high speeds and load capacities with reduced vibration and noise. Linear rings and seals protect and extend the lifespan of ball bushing bearings. Ball spline nuts provide precise movement along spline shafts, and they have high load and torque capabilities. Linear square sleeve bearings mount on square shafts in any orientation with high load capacity and accuracy. Linear die sets fit the mounting holes of the punch holder in standard dies and compensate for torsional misalignment.