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.
; for example, each edge of a hexagon subtends an angle of 360 / 6 60 degrees at its center. The interior angles of an n-gon are the same and equal 180 2 /nn degrees; for example, the interior angles of a square are 180 4 2 / 4 90 180 8 2 / 8 135 degrees and of an octagon are degrees. The inte-rior and central angles are supplementary; they sum to 180