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2. 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.

3. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   A screw thread is a ridge 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. A screw thread is the essential feature of the screw as a simple machine and also as a threaded fastener . The mechanical advantage of a screw thread depends on its lead ...

4. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   Designation. 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 ...

5. Square thread form - Wikipedia

   en.wikipedia.org/wiki/Square_thread_form

   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.

6. Trapezoidal thread form - Wikipedia

   en.wikipedia.org/wiki/Trapezoidal_thread_form

   The actual thread heights on both the internal (nut) and external (bolt) threads differ from ⁠ P / 2 ⁠ by allowances (or clearances): A minimum root-crest clearance of 0.01 in (0.25 mm) (diametral) between opposing threads with 10 tpi (threads-per-inch) or fewer, and 0.005 in (0.13 mm) for finer pitches.

7. Lead (engineering) - Wikipedia

   en.wikipedia.org/wiki/Lead_(engineering)

   Lead is the axial advance of a helix or screw during one complete turn (360°) [ 1] The lead for a screw thread is the axial travel for a single revolution. [ 2] Pitch is defined as the axial distance between adjacent threads on a helix or screw. In most screws, called " single start " screws, which have a single helical thread along their ...