... standard 2. A B C Single Double type 3. 45 steel \ A3 Q235 A-typeA-type sprockets (plate wheel) ... 100B, 120B, 140B, 160B, 180B, 200B, 240B.C-typeWe can provide the following items as stock with quick ... 140C, 160C, 180C, 200C, 240C.Duplex B-typeDuplex C-typeThese sprockets(duplex) with one side or both hubs ... SUS2042B, SUS2050B, SUS2052B, SUS2060B, SUS2062B. A B C singgle double Sprocket welding in Japan