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Below is a comprehensive drill and tap size chart for all drills and taps: Inch, 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.
where is the tap drill size, is the major diameter of the tap (e.g., 3 ⁄ 8 in for a 3 ⁄ 8-16 tap), and / is the thread pitch (1 ⁄ 16 inch in the case of a 3 ⁄ 8-16 tap). For a 3 ⁄ 8-16 tap, the above formula would produce 5 ⁄ 16, which is the correct tap drill diameter. The above formula ultimately results in an approximate 75% 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.
A comprehensive drill bit and tap size chart lists metric and ... The inserts come in various sizes that range from 7 ⁄ 16 to 2.5 ... A 3 ⁄ 8 in × 18 in (9.5 mm ...
One aspect of this method of sizing is that the size increment between drill bits becomes larger as bit sizes get smaller: 100% for the step from 1/64 to 1/32, but a much smaller percentage between 1 47/64 and 1 3/4. Drill bit sizes are written as irreducible fractions. So, instead of 78/64 inch, or 1 14/64 inch, the size is noted as 1 7/32 inch.
The metric screw tap and clearance sizes are largely missing, and those clearance hole sizes that are present are more often incorrect; e.g. M5 x 0.8 has 5.1 mm as close fit, but this would be an interference fit, all sources have 5.3 mm. (0.1 mm is below the sum of surface roughness and tolerance of the screw and clearance drill diameter ...
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 ...
The table shows suitable tapping drill sizes. Uncommon sizes are shown in italics. ... 5 ⁄ 8: 8.2 mm: 7 ⁄ 16: 0.44 11.18 18 18.03 11 ... Spanner size chart
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