HSS roller chain sprocket hob Specification :(mm) Specification (Pitch ×Roller Dia.)Outside Dia.Overall LengthHole Dia.9.525×6.3570602712.7×8.51807015.875×10.1690853219.05×11.9110010025.4×15.87511511531.75×19.051401404038.1×22.2314015044.45×25.415018050.8×28.5816020063.5×39.68180240 We can design and manufacture sprocket hob as your drawings of number of sprocket.