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+1 (217) 579-8045Shop Martin Sprocket S1218 and trust MRO to be your reliable Martin Sprocket supplier to experience the difference that quality and expertise can make. Trusted since 1898. Fast, Free Shipping. Material Steel Face Width 0.750 in. Diametral Pitch 12 Bore Type Reborable Pressure Angle 14.500 deg. Set Screw Size NONE in. Number of Teeth 18 Set Screw Location None Pitch Diameter 1.500 in. Hub Outside Diameter 1.250 in. Outside Diameter 1.667 in. Hub Projection 0.500 in. Storage Dimension Length 1.667 in. Weight 0.42 lbs. Storage Dimension Width 1.667 in. Individually Packaged No Storage Dimension Height 1.250 in.