... bearing with High Quality Control Prompt Delivery zwz Thrust Ball Bearings brand: UNR bearings China Thrust Ball Bearings 51108 Stainless steel Features ... ;51130;51220;53220;51320;53320;52220,51108Ring MaterialGCr15, GCr15SiMn, Chrom steel, 52100Cage materialBrass, steelID size20mm— 1600mmQuality standardISO9001:2000PrecisionP0, P6, P5ClearanceC2, C3 ...