Ball bearing Ball bearings Miniature ball bearings BALL BEARING S type (balls and rings: bearing steel) S type (balls and rings: bearing steel) H type (balls: silicon nitride, Si3N4/rings: bearing steel) : These ball bearings are designed for motorized and non-motorized spindles and feature the optimal internal structure for minimizing heat generation and improving seizure resistance. The H type can be lubricated with grease at speeds where conventional bearings require Oil-Air lubrication. Additionally, both the S type and H type are capable of speeds 20% higher than conventional precision angular contact ball bearings.