1.material:C45 2.teeth:16 3.outer diameter:87.3mm 4.inner diameter:12mm 5.pitch:12.70 Specificationsindustrial transmission roller chain sprocket MaterialC45,40Cr,20CrMnTi,42CrMo,stainless steel ..... as per your requestprocessForging or castingHeat treatmentHigh frequency quenching, teeth hardeningSurface treatmentBlacking as per customer's requirementstandardGB1244-85,DIN8187,8188;ISO/R606Model ...