... aerospace and so on high precision mechanical fitting.B. Stainless steel ball:AISI316L(American),Ocr19Ni12N02(Chinese),degree of hardness≤30 ... cosmetics and so on has certain corrosive product.C. Stainless steel ball:AISI304(American),Ocr19Ni9(Chinese),degree of hardness≤30 ... appliance instrument,and so on terminal.D. General stainless steel ball;Diameter:0.08-50.8mm,non-standard orders customized are ...