Number of Teeth (Chordal Action)Nom. Pitch DiameterNom. Outer Diameter Nom. Hub Width Available Bore Sizes
inmminmminmmRound inSquare inRound mmSquare mm
12 (3.41%)3.9993.8972.050.8 1.5 40
16 (1.92%)5.21325.11302.050.8 1.5 40
20 (1.23%)6.41636.41632.050.8 1.5 40