BS standard (European regular) roller chains require special BS sprockets (RS sprockets/JIS standards cannot be used because of a different tooth width and external diameter).
Sizes, hardened teeth specifications, and bore finishings not demonstrated in the dimensional chart are also available on an MTO basis. Get in touch with a Tsubaki representative to learn more.
Fit 
Bore Series can be available with finished bores.
Sizes not proven in the dimensional chart are also on an MTO basis (For instance: 20B, 56B). Get in touch with a Tsubaki representative to learn more