Number of Teeth (Chordal Action)Nom. Pitch DiameterNom. Outer Diameter Nom. Hub Width Available Bore Sizes
inmminmminmmRound inSquare inRound mmSquare mm
12 (3.41%)2.3582.3581.0251.01.02525
16 (1.92%)3.1793.1791.0251.0, 1-1/16, 1-1/8, 1-1/4 25, 30
18 (1.52%)3.5893.5891.0251.01.0 25
20 (1.23%)3.8973.8971.025 1.5 40
24 (0.86%)4.61174.71191.0251.0, 1-1/8, 1-3/16, 1-1/4 25, 30
26 (0.73%)5.11305.11301.0251.0, 1-1/16, 1-1/8, 1-1/41.525, 3040
32 (0.48%)6.11556.21571.0251.0, 1-1/16, 1-1/8, 1-3/16, 1-1/4 1-1/2 25, 30, 40