HCB gives the best result for long-life used of bearings and in all units of machine manufacturing.  HCB bearing housings are manufactured of grey cast iron (GG 20) according to DIN 736-737 and ISO / R 113 norms. Cast steel (GS 45-52) can also b supplied on request. HCB bearing housings should be preferred since it is hard to change the bearings and taking in to account your valuable time.