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Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, ... 13 ⁄ 32: 7 ⁄ 16-40 10.4902 0.41300 Z 10.5000 0.41339 M12×1.75 75
A comprehensive table for metric, fractional wire and tapping sizes can be found at the drill and tap size chart. Metric drill bit sizes ... 13.890625 9 ⁄ 16: 0.5625
75% tap drill size (in) (mm) (in −1) (mm) ... 16.6 13 ⁄ 16: 20.638 10: 2.540 ... a spanner marked 7 ⁄ 16 BSF is the same size as one marked 3 ...
where is the tap drill size, is the major diameter of the tap (e.g., 3 ⁄ 8 in for a 3 ⁄ 8-16 tap), and / is the thread pitch (1 ⁄ 16 inch in the case of a 3 ⁄ 8-16 tap). For a 3 ⁄ 8-16 tap, the above formula would produce 5 ⁄ 16, which is the correct tap drill diameter. The above formula ultimately results in an approximate 75% thread.
Standardization efforts in the late 19th and the early part of the 20th century reduced the range of sizes considerably. Now, it is less common to see machine screws larger than #14, or odd number sizes other than #1, #3 and #5. Even though #14 and #16 screws are still available, they are not as common as sizes #0 through #12. [citation needed]
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