Chain Sprocket Bore Diameter 1/2 in For Chain Pitch 1/4 in For Number of Strands Single Hub Type One Side Material Stainless Steel Maximum Bore Diameter 1 3/8 in Number of Teeth 72 Outside Diameter 5.717 in Pitch Diameter 5.731 in Bore Type Plain Chain Number 25 Finish Plain Hub Diameter 2 in Hub Projection 0.75 in Standards REACH Certification RoHS Compliant