Low friction ball bearings
C4 class, these type of bearings have rolling bodies (the balls) with tight dimensional tolerances. It has a different number of balls compared to the normal balls bearings and therefore can withstand static and dynamic loads comparable to those of the roller bearings, with much lower levels of friction. This kind of bearing is made with steel alloys with high hardness and high modulus of elasticity furthermore they have diamond finished grooves to ensure an ultra-low rolling friction. These bearings have very high flow characteristics and can withstand rotational speeds of the order of 20,000 rpm.
recommended for gearbox shafts