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Such an appropriately sized drill is called a tap drill for that size of thread, because it is a correct drill to be followed by the tap. Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%.
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.
Blue lines are standard metric drill sizes used for metric taps of the size indicated in the Tap Size column. The clearance sizes need to be left as drill nomenclature (3/64, 6.5 mm, #37) rather than converting to decimal dimensions since having that dimension you have to chase down the table to find the actual drill that it represents.
While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The ...
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 ...
The shortest SDS-plus masonry drill bits are about 110 mm overall length, and the longest 1500 mm. SDS-max is more common for larger rotary hammers and chipping guns, and common sizes start at 1 ⁄ 2 inch (13 mm) diameter up to 1 + 3 ⁄ 4 inches (44 mm) diameter. Standard lengths are 12 to 21 inches (300 to 530 mm).