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2. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   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.

3. 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.

4. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   The twist drill bit is the type produced in largest quantity today. It comprises a cutting point at the tip of a cylindrical shaft with helical flutes; the flutes act as an Archimedean screw and lift swarf out of the hole. The modern-style twist drill bit was invented by Sir Joseph Whitworth in 1860.

5. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.

6. Twist drill - Wikipedia

   en.wikipedia.org/?title=Twist_drill&redirect=no

   Drill bit#Twist drill bit; Retrieved from "https: ... Print/export. Download as PDF; Printable version;

7. Category:Hole making - Wikipedia

   en.wikipedia.org/wiki/Category:Hole_making

   Download as PDF; Printable version; In other projects Wikimedia Commons; ... Drill; List of drill and tap sizes; Drill bit; Drill bit shank; Drill bit sizes; Drilling ...