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2. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   Drill bit sizes are written as irreducible fractions. So, instead of 78/64 inch, or 1 14/64 inch, the size is noted as 1 7/32 inch. Below is a chart providing the decimal-fraction equivalents that are most relevant to fractional-inch drill bit sizes (that is, 0 to 1 by 64ths).

3. 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).

4. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The included angle of the spotting drill bit should be the same as, or greater than, the conventional drill bit so that the drill bit will then ...

5. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   LOX type screw and bits. The LOX-Recess screw drive was invented by Brad Wagner, and fasteners using it are distributed by licensees Hitachi, Dietrick Metal Framing, and Grabber. [41] The design is four overlapping square recesses, with 12 contact points, and is designed to tolerate more torque, decrease wear, and avoid cam-out. [42]

6. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.

7. Drill - Wikipedia

   en.wikipedia.org/wiki/Drill

   Typically a given drill will have its capacity specified for different materials, i.e., 10 mm for steel, 25 mm for wood, etc. For example, the maximum recommended capacities for the DeWalt DCD790 cordless drill for specific drill bit types and materials are as follows: [ 27 ]