An industry rating for ball bearing tolerances, in classes 1, 3, 5, 7 and 9.
What it is
The ABEC scale was created by the Annular Bearing Engineering Committee of the American Bearing Manufacturers Association. It grades how precisely a ball bearing is made in five classes: 1, 3, 5, 7 and 9. Higher numbers mean tighter tolerances.
In your EDC
Spinner makers often quote ABEC ratings. A higher class means a more precise bearing, but spin time also depends on the bearing's material, lubrication and shields, so ABEC alone does not tell the whole story.
是什么
ABEC 等级由美国轴承制造商协会下属的环形轴承工程委员会（Annular Bearing Engineering Committee）制定，按滚珠轴承的制造精度分为五级：1、3、5、7 和 9。数字越高，公差越小。
EDC 中的应用
指尖陀螺的品牌常会标注 ABEC 等级。等级越高代表轴承越精密，但旋转时间还取决于轴承的材质、润滑和防尘盖，所以只看 ABEC 并不全面。
