Precision Grades

RBC thin section ball bearings are available in four precision grades.  Precision Classes 0, 3, 4 and 6 correspond to ABMA ABEC grades 1F, 3F, 5F and 7F respectively. The tolerances for the bearing bores, outer diameters, radial runouts, axial runouts and radial plays are shown in the tolerances tables links below.

Shaft & Housing Fits

Proper shaft and housing fits are critical to the successful operation of a thin section ball bearing. The internal clearance of the bearing will be reduced proportionally by an interference fit.  It addition, the roundness of the inner and outer ring raceways. For most applications the inner ring is rotating and the load is stationery with respect to the outer ring. In this situation a light press fit onto the shaft in recommended. The recommended shaft and housing fits are shown in the tolerances tables listed below.

Y-PWI Series

• Tolerances, Recommended Fit and Load Ratings

Tolerances and Recommended Fits

• Precision Class 0 – ABEC 1F C-Type
• Precision Class 0 – ABEC 1F A-Type and X-Type
• Precision Class 3 – ABEC 3F All Types
• Precision Class 4 – ABEC 5F All Types
• Precision Class 6 – ABEC 7F All Types

Thin Dense Chrome Coated – N Series Tolerances and Recommended Fits

• Precision Class 0 – ABEC 1F A-Type and X-Type
• Precision Class 0 – ABEC 1F C-Type
• Precision Class 3 – ABEC 3F All Types
• Precision Class 4 – ABEC 5F All Types
• Precision Class 6 – ABEC 6F All Types