The term "involute" refers to the shape of the teeth: the curves of the teeth are involutes of circles, which are curves that optimize gear performance. Figure 1.1.2: The three marked circles are key ...

A M10 nut at the default tolerance has a major diameter (which is the inside diameter) between 10 mm and 10.4 mm. Shrinking the major diameter of a screw makes the screw loose. Shrinking the major ...