What are the accuracy grades of a ball screw?
Ball Screws are classified into six classes under the JIS: C0, C1, C3, and C5 for positioning, and C7 and C10 for transport.
KURODA offers C2 and C4 as manufacturer standards for positioning Ball Screws, which, combined with the JIS classification, give eight classes, allowing for more optimal selection. The larger the number after C, the lower the accuracy class. Ball screw accuracy is classified into lead accuracy, mounting accuracy of the screw shaft and each part of the nut, and preload torque fluctuation rate, and allowable values are set for each accuracy class.
Example: A ball screw with precision class C5 is a ball screw that is within the allowable values of "lead precision C5 class," "mounting precision of the screw shaft and each nut part C5 class," and "preload torque fluctuation rate C5 class."
Ball screw selection guide
It is necessary to select the ball screw accuracy grade that matches the positioning accuracy required by the type of machine or device. Please refer to the data in the catalog.
Based on our extensive track record, KURODA recommends selecting a grade based on the guidelines in the table below.
Technical information list about Ball Screws
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