Linear Ball Bearing, System of Measurement Inch, Inside Diameter 1/4 in, Outside Diameter 1/2 in, Self-Alignment Self-Aligning, Overall Length 3/4 in, Dynamic Load Capacity 60 lbf, Material Delrin, Series Super, Steady State Speed 10 fps, Maximum Operating Temperature 185 Degrees F, Minimum Operating Temperature 0 Degrees F, Inside Diameter Tolerance +/-0.001 in, Accelerated Speed 450 fps