| Number of Teeth (Chordal Action) | Nom. Pitch Diameter | Nom. Outer Diameter | Nom. Hub Width | Available Bore Sizes | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| in | mm | in | mm | in | mm | Round in1 | Square in | Round mm1 | Square mm | |
| 18 (1.54%) | 3.5 | 89 | 3.5 | 89 | 1.7 | 43 | 1.5 | 40 | ||
| 24 (0.86%) | 4.6 | 117 | 4.7 | 119 | 1.7 | 43 | 1, 1-3/16, 1-1/4 | 1.5 | 30 | 40 |
| 26 (0.73%) | 5.1 | 130 | 5.1 | 130 | 1.7 | 43 | 1, 1-3/16, 1-1/4 | 1.5, 2.5 | 40, 60 | |
| 32 (0.48%) | 6.1 | 155 | 6.2 | 157 | 1.7 | 43 | 1, 1-3/16, 1-1/4, 1-1/2 | 1.5, 2.5 | 40, 60 | |
U.S. key sizes on round bore sprockets are based on ANSI standard B17.1-1967 (R1989) and metric key sizes are based on DIN standard 6885.
