Silicon Nitride was selected for the balls because it is: 40% lighter than steel, inert to chemicals (vapors, sea water, caustic washing and sterilizing solutions), capable of higher speeds and higher loads: (RC78 hardness), FDA compliant (used in surgical instruments), and does not corrode or support electrolysis. The shell, bearing retainer and end caps are made from 440 Stainless Steel and coated with Armoloy TDCTM (Thin Dense Chrome). Armoloy is a hard (78Rc), coating with a micro-nodular surface texture. The coating’s nodular finish reduces the amount of surface area in contact with the SiNi balls reducing friction and extending life. Pegasus Linear Bearings are available in two series (closed and open), and in four sizes (1.000 in., 1.250 in., 1.500 in. and 2.000 in.). Dynamic load rating for these bearings are: 1.000 in. 220 lb, 1.250 in. 352 lb, 1.500-in. 490 lb, and 2.000-in. 858 lb. Bearings are designed for zero clearance on Class L linear shafting. For maximum performance we recommend LM76 Case Hardened 440 Stainless Steel shafting with Armoloy™ coating. For more information, visit www.lm76.com.