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2. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The standard thread pitch is approximately ⁠ 1 / 4 ⁠ of the major diameter. The thread form is slightly modified to increase the minor diameter, and thus the strength of screws and taps. The major diameter still extends to within ⁠ 1 / 8 ⁠ H of the theoretical sharp V, but the total depth of the thread is reduced 4% from ⁠ 5 / 8 ⁠ H ...

3. United States Standard thread - Wikipedia

   en.wikipedia.org/wiki/United_States_Standard_thread

   However, there are tolerance and other differences between a thread compliant with the USS thread and a Unified Thread Standard UNC thread. [8] The Unified Thread Standard for quarter inch and larger threaded fasteners was adopted on November 18, 1948, [9] and was subsequently adopted for smaller thread series.

4. British Standard Whitworth - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Whitworth

   The Whitworth thread was the world's first national screw thread standard, [1] ... 7 ⁄ 8: 1.480 37.6 1.300 ... Unified Thread Standard (UTS, including UNC, UNF, UNS ...

5. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   For example, 1 ⁄ 2-13 belongs to the UNC series (Unified National Coarse) and 1 ⁄ 2-20 belongs to the UNF series (Unified National Fine). Similarly, M10 (10 mm nominal outer diameter) as per ISO 261 has a coarse thread version at 1.5 mm pitch and a fine thread version at 1.25 mm pitch.

6. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   Unified Inch Screw Threads (UN and UNR Thread Form) V Thread Form: 1 ⁄ 4 ″-20 UNC #4-40 UNC ASME B1.5-1997 (R2014) Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified Miniature Screw Threads: V Thread Form: 0.60 UNM ANSI/ASME ...

7. Computer case screws - Wikipedia

   en.wikipedia.org/wiki/Computer_case_screws

   The #6-32 UNC screw has a thread pitch of 1/32 in (0.031250 inches (0.7938 mm)). The #6-32 UNC is a UTS screw specifying a major thread diameter of #6 which is defined as 0.1380 inches (3.51 mm); and 32 tpi (threads per inch) which equates to a thread pitch of 0.031250 inches (0.7938 mm). The optional UNC specification indicates the standard ...