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2. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Example (inch, fine): For 7 ⁄ 16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).

3. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   So a 1 / 2 in (12.7 mm) diameter drill will be able to drill a hole 4 + 1 / 2 in (114.3 mm) deep, since it is 9 times the diameter in length. A 1 / 8 in (3.175 mm) diameter drill can drill a hole 1 + 5 / 8 in (41.275 mm) deep, since it is 13 times the diameter in flute length. [3]

4. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Joseph Whitworth in 1841 proposed that a standard should be set, ... allow the cage to be inserted into the square holes Clip-on nut: ... 3 ⁄ 16: 0.1875 4.763 5.18

5. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   9.5: 12–14 7 ⁄ 16: 11: 16–18 1 ... The triple-square, ... one of the lug nuts on each wheel may require a specialized socket provided with the set of lug nuts ...

6. Square thread form - Wikipedia

   en.wikipedia.org/wiki/Square_thread_form

   The greatest advantage of square threads is that they have a much higher intrinsic efficiency than trapezoidal threads (Acme or metric trapezoidal). Due to the lack of a thread angle there is no radial pressure, or bursting pressure, on the nut. This also increases the nut life. [1] The greatest disadvantage is the difficulty in machining such ...

7. Bore gauge - Wikipedia

   en.wikipedia.org/wiki/Bore_gauge

   Small-hole gauge set. Sizes from top to bottom: 3 to 5 mm (0.118 to 0.197 in) 5 to 7.5 mm (0.197 to 0.295 in) 7.5 to 10 mm (0.295 to 0.394 in) 10 to 13 mm (0.394 to 0.512 in) Small-hole gauges require a slightly different technique to the telescopic gauges, the small hole gauge is initially set smaller than the bore to be measured.

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   mail.aol.com

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9. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   The nominal diameter of Metric (e.g. M8) and Unified (e.g. 5 ⁄ 16 in) threads is the theoretical major diameter of the male thread, which is truncated (diametrically) by 0.866 ⁄ 4 of the pitch from the dimension over the tips of the "fundamental" (sharp cornered) triangles.