Drill Size = Major Diameter - (.975 divided by the number of threads per inch). For example, with a 1/4-32 tap, .250 - .0305 = .2195 (7/32 or #2 drill size). Metric tap drill sizes are the diameter minus the pitch (For example, 42mm x 1.5 tap uses a 40.5 drill). Follow these links to browse our taps and die selection:
It is easy to construct a concave figure if the figure has at least 4 sides Just make sure that one interior angle is bigger than 180 degrees. In other words, an interior angle should be a reflex angle Why am I saying at least 4 sides? It is possible to make a concave triangle? The answer is no! Since the sum of the interior angles in any triangle must add up to 180 degrees, no interior angles can be more than 180. It is impossible! Buy a comprehensive geometric formulas ebook.
The interior angles only add to 180Â° when the triangle is planar, meaning it is lying on a flat plane. If the triangle is not planar, for example if it is lying on the curved surface of a sphere, the angles do not add to 180Â°. 1  Triangle definition.  Hypotenuse.