1.Standard:GB,DIN,ASME,BSW,UNC,JIS2.Grade:Gr1,Gr2,Gr3,Gr5,Gr7,Gr9,Gr12,Gr23
3.Application: Bicycle,Motorcycles,car,bike, machine, industry,military,metallurgy,medical
4.Certificate: ISO 90012000 , GB/T 19001∼ 2000 .