... : Single direction thrust ball bearing. 2) Product number.: 51100, 51101, 51102, 51103, 51104, 51105, 51106, 51107, 51108 ... , 51109, 51110 (see table below). 3) Product material: Chrome steel SAE 52100 or Stainless steel SUS 440C ... ABEC-1, ABEC-3 grade. 5) Product brand: neutral brand, OEM service is welcome. 6) Product packing: Industrial packaging or individual box packaging ...