... Japan standard 2. A B C Single Double type 3. 45 steel \ A3 Q235 A-typeA-type sprockets ( ... installations of conveyor rolls or chains require a sprocket for use with two single strand ... as water, steam or chemical corrosive conditions as acid and alkaline.SUS 25B, SUS35B, SUS40B, SUS60B, ... 2082B, SUS2040B, SUS2042B, SUS2050B, SUS2052B, SUS2060B, SUS2062B. A B C singgle double Sprocket welding in Japan