JIS R 6241:2018规定了正常运行速度的限制和砂轮最大运行速度的确定方法，以及根据最大运行速度确定的砂轮类型的尺寸限制。

JIS R 6241:2018 specifies the limit of regular operating speed and the determination method of maximum operating speed of grinding wheels, and the dimensional limit by the types of grinding wheels according to the maximum operating speed.