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2. British Standard Fine - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Fine

   British Standard Fine (BSF) is a screw thread form, as a fine-pitch alternative to British Standard Whitworth (BSW) thread. It was used for steel bolts and nuts on and in much of Britain's machinery, including cars, prior to adoption of Unified , and later Metric , standards.

3. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   This is because extra fine threads are more resistant to coming loose from vibrations. [8] Fine and superfine threads also have a greater minor diameter than coarse threads, which means the bolt or stud has a greater cross-sectional area (and therefore greater load-carrying capability) for the same nominal diameter.

4. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   Each thread in the series is characterized by its major diameter D maj and its pitch, P. UTS threads consist of a symmetric V-shaped thread. In any plane containing the thread axis, the flanks of the V have an angle of 60° to each other. The outermost 1 ⁄ 8 and the innermost 1 ⁄ 4 of the height H of the V-shape are cut off from the profile.

5. British Standard Whitworth - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Whitworth

   1 ⁄ 8: 3.175 40: 0.635 0.0930 2.362 ... to the Whitworth 55° and very fine thread pitches. ... 1923 to 1955 were built using metric threads with bolt heads and ...

6. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   Royal Microscopical Society (RMS) thread, also known as society thread, is a special 0.8-inch diameter × 36 thread-per-inch (TPI) Whitworth thread form used for microscope objective lenses. Microphone stands: 5 ⁄ 8-inch 27 threads per inch (TPI) Unified Special thread (UNS, USA and the rest of the world)

7. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Example (inch, fine): For 7 ⁄ 16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).