De module m for spur gears (NEN 1630, DIN 780, ISO54) in two series, series 1 is preferred.
series 1 0.1 0.12 0.16 0.20 0.25 0.3 0.4 0.5 0.6 0.7 0.8
0.9 1 1.25 1.5 2 2.5 3 4 5 6 8
10 12 16 20 25 32 40 50 60
series 2 0.11 0.14 0.18 0.22 0.28 0.35 0.45 0.55 0.65 0.75 0.85
0.95 1.125 1.375 1.75 2.25 2.75 3.5 4.5 5.5 7 9
11 14 18 22 28 36 45 55 70