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  2. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Schematic of a machine tap. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter.. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

  3. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    Unified Screw ThreadsUNC, UNF and UNEF [2]: 1816 Major diameter D maj (inch, mm) Thread density (d, threads per inch) and thread pitch (p) Preferred cutting tap drill size; Coarse (UNC) Fine (UNF) Extra fine (UNEF) d p (inch, mm) d (TPI) p (inch, mm) d (TPI) p (inch, mm) Coarse Fine Extra fine #0: 0.0600 1.5240: None: 80: 0.012500 0.3175 ...

  4. List of thread standards - Wikipedia

    en.wikipedia.org/wiki/List_of_thread_standards

    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 B1.11-1958 (R2016) Microscope Objective Thread: V ...

  5. British Standard Whitworth - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Whitworth

    Whitworth thread sizes [4] [5] [6] Major diameter Thread density Thread pitch Minor diameter 75% tap drill size (in) (mm) (in −1) (mm) (in) (mm) (in) (mm) 1 ⁄ 16: 1.588 60: 0.423 0.0412 1.046 #56: 1.2 3 ⁄ 32: 2.381 48: 0.529 0.0671 1.704 #49: 1.9 1 ⁄ 8: 3.175 40: 0.635 0.0930 2.362 #39: 2.6 5 ⁄ 32: 3.969 32: 0.794 0.1162 2.951 #30: 3 ...

  6. Talk:Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Talk:Unified_Thread_Standard

    For example, for a 1/4-28 thread, both 5.5 mm and 5.6 mm drills make good tap drills for virtually any purposes, even though 7/32" is the principal tap drill. The idea is explained more at List of drill and tap sizes § Rules of thumb , and then worked examples are given at List of drill and tap sizes § Examples .

  7. ISO metric screw thread - Wikipedia

    en.wikipedia.org/wiki/ISO_metric_screw_thread

    Because only 5 ⁄ 8 of this height is cut, the difference between major and minor diameters is 5 ⁄ 4 × 0.8660 × P = 1.0825 × P, so the tap drill size can be approximated by subtracting the thread pitch from the major diameter.

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