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This is a gear with 40 straight teeth, normal module 1, pressure angle equal to 20° (external toothing).
Teeth profile accomplishes to technical norms: involute profile permits to this part to be successfully coupled to other gears of the same parameters above indicated.
The central hole is Ø .
Robotics as for any project that requires motion transmission needs customized gears. Ask for Your personal needings: Studio BitLab will generate the project and supply the physical object printed by Shapeways.