Cross roller bearings, because the inner or outer ring is split, and the interval after loading the roller cage, and Cross-Roller Ring secured together to prevent separation from each other, so when you install the Cross-Roller Ring Operation simple. Since the roller is staggered, so only one set of Cross-Roller Ring can withstand the loads in all directions, compared with the traditional model, rigidity increased by 3 to 4 times. Meanwhile, due to cross roller bearing inner or outer ring is constructed of two split, adjustable bearing clearance, even if they are applied preload can be obtained with high precision rotary motion.