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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

   For example, “.750-10 UNC-2A” is male (A) with a nominal major diameter of 0.750 inches, 10 threads per inch, and a class-2 fit; “.500-20 UNF-1B” would be female (B) with a 0.500-inch nominal major diameter, 20 threads per inch, and a class-1 fit. An arrow points from this designation to the surface in question. [19]

4. Thread pitch gauge - Wikipedia

   en.wikipedia.org/wiki/Thread_pitch_gauge

   A thread gauge, [ 1] also known as a screw gauge[ 2] or pitch gauge, [ 3] is used to measure the pitch or lead of a screw thread . Thread pitch gauges are used as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole. This tool is not used as a precision measuring instrument, rather it allows the user to ...

5. United States Standard thread - Wikipedia

   en.wikipedia.org/wiki/United_States_Standard_thread

   This flat length is defined as the pitch divided by eight. The thread depth, which is from flat to flat is 0.6495 times the pitch. [4] For 1 ⁄ 4-inch (6.4 mm) screws and larger, the pitch is defined as: = + where P is the pitch and D is the diameter of the rough stock. [1]

6. British Standard Whitworth - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Whitworth

   The Unified thread angle is 60° and has flattened crests (Whitworth crests are rounded). From 1 ⁄ 4 in up to 1 + 1 ⁄ 2 in, thread pitch is the same in both systems except that the thread pitch for the 1 ⁄ 2 in bolt is 12 threads per inch (tpi) in BSW versus 13 tpi in the UNC.

7. 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 ...