Bearing Standards Explained: ISO, ANSI, ASTM & ABEC Guide for Engineers and Buyer
06/17/2026
References: ISO 492:2023 | ABMA Standard 20 | ASTM A295 | ISO 281:2007 | DIN 620 When you source a bearing, the spec sheet lists a string of abbreviations—ISO P5, ABEC 3, ASTM A295, ANSI/ABMA 20. These aren’t marketing labels. They’re references to internationally recognized standards that define exactly how a bearing is built, how precisely it is made, and what materials it contains. Understanding these standards is essential whether you’re an engineer selecting bearings for a new design or a procurement manager qualifying a supplier.