... Japan 1. Japan standard 2. A B C Single Double type 3. 45 steel \ A3 Q235 A-typeA ... to the next.We can provide finished bore single-double sprockets as your request40SD, 50SD, 60SD, 80SD, ... 25B, SUS35B, SUS40B, SUS60B, SUS80B.Double pitchWe can provide following double pitch sprocket as stock with quick delivery. ... , SUS2050B, SUS2052B, SUS2060B, SUS2062B. A B C singgle double Sprocket welding in Japan