Our A Series Roller Chain meet or exceed DIN, ANSI,ISO,BS,JS standard, ... stand up to the toughest working environment. Our A Series Roller Chain meet or exceed DIN, ANSI,ISO,BS,JS standard ... relations with you in the near future.General Standard for Roller Chain:ROLLERSolid RollerMaterial 1035,1045 or 1050Through harden with surface ... 39-45HRCShot peening per the spec 5-Strands A Series Roller Chain