Accuracy Grades

DIN / ISO / JIS or ANSI Standard
All stipulations used here comply fully to the German DIN 69 051/part I-VI, and the European ISO/DIS 3408 standards. This applies especially to the calculation of load capacity and stiffness. When comparing, be sure to interpret values stated according to ANSI B5.48 standard correctly. If uncertain, please contact our engineering service for assistance.

Standard Lead Accuracy Grades
Steinmeyer ballscrews are available as standard in five different accuracy grades, according to ISO standards (grades 1, 3, 5 for high precision ballscrews and grades 7 and 10 for normal precision ballscrews). Two accuracy grades have been added to meet requirements as per JIS standard, grades 0 and 2. Regarding lead accuracy, both standards use five different values to define limits for mean travel deviation, travel variations and specified travel deviation. The respective stipulations that refer to the JIS standard are given in parenthesis.

c:	Specified lead deviation, is used to compensate the effects of heat or if the screw is held under tension (T).
ep:	Represents the deviation of a straight line, which is to be drawn as an average of the actual lead deviation over the full travel (E).
vup:	Permissible variation of lead over full travel, which is defined as the vertical distance of two straight lines parallel to the average (ep), which include maximum and minimum of the lead graph (e)
v300p:	Same as vup , but refers to the maximum within any interval of 300 mm (e300 ).
v2a:	Variation of lead within one revolution (e2).

Tolerances for the mean lead deviation e_0a
Tolerances v_up for the variation v_ua
Tolerances v_300p for the variation v_300a
Tolerances v_2p for the variation v_2a