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  2. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use. The 85% and 90% rules works best in the range of 141 in (6.4–25.4 mm), the sizes most important on many shop floors. Some sizes outside that range have different ...

  3. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    Jobber-length drills are the most commonly found type of drill. The length of the flutes is between 9 and 14 times the diameter of the drill, depending on the drill size. 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

  4. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    A comprehensive drill bit and tap size chart lists metric and ... A core drill bit may be used to double the size of a hole. ... #4 is 4/16 or 1/4 in (6 mm), #6 is 6/ ...

  5. 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.

  6. ISO metric screw thread - Wikipedia

    en.wikipedia.org/wiki/ISO_metric_screw_thread

    A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25). If the pitch is the normally used "coarse" pitch listed in ISO 261 or ...

  7. Talk:List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/Talk:List_of_drill_and_tap...

    The metric screw tap and clearance sizes are largely missing, and those clearance hole sizes that are present are more often incorrect; e.g. M5 x 0.8 has 5.1 mm as close fit, but this would be an interference fit, all sources have 5.3 mm. (0.1 mm is below the sum of surface roughness and tolerance of the screw and clearance drill diameter ...

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