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Below is a comprehensive drill and tap size chart for all drills ... The drill sizes that are near this are 6.3 mm ... 2.25 mm Drill bit diameter Fractional size
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.
For example, #4 is 4/16 or 1/4 in (6 mm), #6 is 6/16 or 3/8 in (9 mm), #9 is 9/16 in (14 mm), and #16 is 16/16 or 1 in (25 mm). Sets commonly consist of #4-16 or #4-10 bits. The bit shown in the picture is a modern design for use in portable power tools, made in the UK in about 1995.
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.
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 ...
M48 Start of header METRIC Metric units (mm) T 01 C 0.6 Tool 1 has diameter 0.6mm T 02 C 1.0 Tool 2 has diameter 1.0mm % End of header G05 Set drill mode T 01 Select tool 1 X 8.5 Y 4.8 Drill a hole of 0.6 mm at coordinates 8.5mm,4.8mm X 8.55 Y 2.85 Drill X 6.54 Y 2.85 Drill X 6.45 Y 4.8 Drill T 02 Select tool 2 G00X10.25Y3.825 Move to ...
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related to: tapcon drill bits size chart guide reddit 1 6 mm