ABMA 20-2025 ✓ Most Recent

This standard includes:

(a) basic plan for the boundary dimensions of metric radial ball and roller bearings;
(b) general rules for extension of the basic plans;
(c) dimensions and tolerances for snap ring groove and locating snap rings;
(d) dimensions for radial ball bearings with flanged outer ring; and
(e) tolerances for boundary dimensions, chamfers, various runouts, and internal clearance.

This standard does not contain any direction pertaining to internal bearing design nor any indication as to availability of bearings.

Instrument ball bearings, needle roller bearings, tapered roller bearings, thrust bearings and other bearing types and series not conforming to these basic plans for boundary dimensions are covered in other ANSI/ABMA standards.