Hangzhou Zhijiang Sprockets has been making sprockets, chain, gears and other transmission parts for agriculture machines and industrial machines for more than 20years, 25% of our products export to Japan. Japanese customers OCM, Kana is is our long term business partners. Sprockets according to the JIS Standard. If you need JIS standard, please send us inquiry, we would send you JIS catalogue, there are two revision, Japanese vision and Chinese vision. info@zjsprocket.com Roller sprockets, agriculture sprockets, industrial sprockets.