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  2. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    The major minus pitch technique also works for inch-based threads, but you must first calculate the pitch by converting the fraction of threads-per-inch (TPI) into a decimal. For example, a screw with a pitch of 1/20 in (20 threads per inch) has a pitch of 0.050 in and a 1 ⁄ 13 in pitch (13 threads per inch) has a pitch of 0.077 in.

  3. List of thread standards - Wikipedia

    en.wikipedia.org/wiki/List_of_thread_standards

    A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is an inclined plane wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread.

  4. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than ⁠ 1 / 4 ⁠ inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.

  5. 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 ...

  6. United States Standard thread - Wikipedia

    en.wikipedia.org/wiki/United_States_Standard_thread

    United States Standard thread (USS thread), also known as Sellers Standard thread, [1] Franklin Institute thread [1] and American Standard thread, [2] is a standard for inch based threaded fasteners and washers. [3] The USS standard is no longer supported. It, together with the SAE fastener standard, was incorporated into the Unified Thread ...

  7. Talk:Tap and die - Wikipedia

    en.wikipedia.org/wiki/Talk:Tap_and_die

    For example, using a 27/64 (.421) as tap drill for ½-13 yields 75% threads (or thereabouts). Using a 7/16 (.437) as tap drill for ½-13 yields 60% threads (or thereabouts). Irwin-Hanson says that 60% threads are recommended generally because they give about 90% of the potential holding power of the threadform.

  8. Square thread form - Wikipedia

    en.wikipedia.org/wiki/Square_thread_form

    The square thread form is a common screw thread profile, used in high load applications such as leadscrews and jackscrews. It gets its name from the square cross-section of the thread. [ 1 ] It is the lowest friction and most efficient thread form, but it is difficult to fabricate.

  9. Thread angle - Wikipedia

    en.wikipedia.org/wiki/Thread_angle

    In mechanical engineering, the thread angle of a screw is the included angle between the thread flanks, measured in a plane containing the thread axis. [1] This is a defining factor for the shape of a screw thread .