Pitch count tutorial:
1) 48pitch (imperial)
48pitch = 48 teeth / inch
1 inch = 25.4mm, so
25.4mm / 48teeth = 0.529mm/teeth
2) 64pitch (imperial)
same formula, using 64pitch, then 25.4mm/64teeth = 0.397mm/teeth
3)For tamiya, they use metric, Mod0.4 (or 0.4mm/teeth) and Mod0.6 (0.6mm/teeth)
As you can see from the above calculations, Mod0.4 is close to 64pitch and Mod0.6 is close to 48pitch; however, close is NOT good enough in gear meshing. It is better to buy the same pitch count for the best result.
(My opinions only, pls correct me if I am wrong)
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