Description

THK System HRW-27 - Wide Rail, Four-Way Equal-Load Type Simple Type: Accessory Balls roll in four rows of precision-ground raceway on an LM rail and an LM block. The end plate attached to the LM block causes the trains of balls to circulate. As the balls are held in place by the retainer plate, they do not fall off if the LM block is removed from the rail (except for types HRW 12 and 14LR). The four trains of balls are arranged so that the contact angle is 45°, allowing each train of balls to bear an equal load rating in all four directions: radial, reverse-radial, and the two lateral directions. This type can therefore be used in any installation direction. Moreover, type HRW permits the application of a well-balanced preload, making it possible to increase rigidity in the four directions while keeping the friction coefficient low. The overall height is designed to be as low as possible. The LM block is made as thick as possible and is designed to be solidly fastened with six bolts (excluding types HRW12, 14LR, 17, and 21CR). Download the datasheet (PDF)