thrust ball bearing size:511,512,513,514,522,523,524series material:bearing steel,GCR15 hardness:59-63HRC class:ABEC-1 product detail ... description: Bearing Typewith grooved raceway(s)Inner Dia (d)3.000 - 1000 ... chrome steel, GCr15, G20Cr2Ni4ACagepressed steel sheet or Machined BrassOEMsamples available thrust ball bearing