FAQ
Design
The basic SFERAX ball bearing is composed of :
– A housing made of ball bearing steel, machined, hardened to 65 HRC +0 -3, ground and lapped except the B quality, which is only precision-ground
– Brass turned and milled ball tray (GBL) or in polyamid for the GBP execution
– Precision steel balls
– Steel locking rings and plastic control rings injected after assembling