The 624ZZ bearing is a Deep groove ball bearings 60/62/63 series with an inner diameter of 4 mm , an outer diameter of 13 mm, a width of 5 mm. It typically uses ABEC1 ABEC3 ABEC5 grade precision tolerances and 624 OPEN 624ZZ 624-2RS 624-2RZ type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.