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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.
Unified Screw Threads — UNC, 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 ...
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 ...
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 ...
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 .
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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