Super ball linear bearing Super smart ball bushing pillow blocks available in closed, adjustable and open styles in both single and twin versions. Original self aligning precision anti-friction linear bearing with load capacities up to 4, 000 lbf, and speed up to 10 ft/sec (3 m/s). Danaher offers the largest selection of sizes. Type slm: this is the metric dimension series with seal used most frequently in korea and japan. Type skb: this is the metric dimension series with seal used most frequently in europe. Type ssw: this is the metric dimension series with seal used most frequently in england.