This special heat-treatment ensures full bearing performance and prevents the set screws from loosening during operation as the set screws can be tightened hard enough without causing broken inner ring set screw hole.

• 内圈螺钉孔周围经局部高温回火后，轴承获得更好的性能，可防止螺钉在轴承工作期间松脱，同时螺钉拧得紧也不会导致内圈爆裂。