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Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, ... 5 ⁄ 16-18 50 7.1000 0.27953 M8×1.0 75 7.1374 0.28100 K 7.1438
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.
75% tap drill size (in) (mm) (in −1) (mm) ... 5.1 5 ⁄ 16: 7.938 18: 1.411 0.2414 ... Two spanners, both nominal size 5 ...
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]
The table provides BSF sizes, ... Tap drill (in) (mm) (in −1) (mm) ... 5 ⁄ 8: 8.2 mm: 7 ⁄ 16: 0.44 11.18 18 18.03 11 ...
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