THK SHS Caged Ball® LM Guides

THK Rolled Ball Screws are low-priced feed screws that use a screw shaft rolled with high accuracy and specially surface-ground, instead of a thread-ground shaft used in the Precision Ball Screws.
‍
The ball raceways of the ball screw nut are all thread-ground, thus to achieve a smaller axial clearance and smoother motion than the conventional rolled ball screw.
In addition, a wide array of types are offered as standard in order to allow optimal products to be selected according to the application.
‍
[Achieves Lead Angle Accuracy of Class C7]‍
Screw shafts with travel distance error of classes C7 and C8 are also manufactured as the standard in addition to class C10 to meet a broad range of applications.
‍
Travel distance:
C7 : r0.05/300 (mm)
C8 : r0.10/300 (mm)
C10 : r0.21/300 (mm)

<Achieves Roughness of the Ball Raceways of the Screw Shaft at 0.20 a or Less>‍
The surface of the screw shaft’s ball raceways is specially ground after the shaft is rolled to ensure surface roughness of 0.20 a or less, which is equal to that of the ground thread of the Precision Ball Screw.
‍
[The Ball Raceways of the Ball Screw Nut are Finished by Grinding]
‍
THK finishes the ball raceways of Rolled Ball Screw nuts by grinding, just as the Precision Ball Screws, to secure the durability and the smooth motion.
‍
[Low Price]
The screw shaft is induction-hardened or carburized after being rolled, and its surface is then specially ground. This allows the rolled Ball Screw to be priced lower than the Precision Ball Screw with a ground thread.
‍
[Effects of high levels of dust proofing]‍
The ball screw nut is incorporated with a compact labyrinth seal or a brush seal. This achieves low friction, high dust-prevention effect and a longer service life of the Ball Screw.