The 6301ZZ bearing is a Deep groove ball bearings 60/62/63 series with an inner diameter of 12 mm , an outer diameter of 37 mm, a width of 12 mm. It typically uses ABEC1 ABEC3 ABEC5 grade precision tolerances and 6301 OPEN 6301ZZ 6301-2RS 6301-2RZ type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.