1、Whether chamfer is bright
Thought chamfer of the INA fag Bearing does not determine the quality，it reflets the processing method of the bearing. The black chamfer shows the INA roller bearing is quenched to increase the hardness of the bearing. It is a misunderstanding that some people believe the ugly black result in incompletely process.
2、Two-body retainer is better than one,although the new technology to use one retainer. it is only to save materials, when refers to rotation and other properties, it is worse than the two-body retainer.