... such as304,316L,420,440C and other trademark steel balls in various sizes. A. Stainless steel ball:AISI440(American),9cr18(Chinese),degree of ... -50.8mm,makes to order the non-standard,widely applies in the ramming bearing,the valve,the seal,measuring appliance instrument ... -50.8mm,makes to order the non-standard,widely applies in the human body accessories,the medical distant instrument,food machinery ...