Bearing steel has a long life, its thermal conductivity is low, ... ,100CRMNSI6-4,C56E2,S53CG,S55CG,S55C-SV,SAE1070M,SAE1055,CARBURIZED,BEARING STEEL,G20CRNIMO,G20CRNI2MOThe thickness: 1-200mmThe outer diameter: 5-1020mmLength ... beautiful future. We believe tomorrow will be better. GCR15 ball bearing steels