ANSI and ISO Twist drill size chart Fractional and Metric Sizes per. ANSI/ASME B94.11M-1993 below are the standard size drill bits used and readily available in industry. Fractional sizes are measured in inches, while metric sizes are measured in millimeters.

The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. The decimal equivalents of the diameters are shown in both English and Metric units.

Letter Drill Sizes. This chart shows the diameters of letter gauge drills size A (the smallest) to size Z (the largest).

Centerdrill Dimensions for standard type and bell type combined drill and countersinks

Complete drill bit size chart with conversions between fractional, decimal, metric, letter & number sizes. Free printable drill bit size charts and conversion tables.

These specialist drill bits are used for drilling centreholes at two different angles, 60 degrees and90 degrees. They are commonly used to drill lathe centres and spotting drills, i.e.marking holes to guide twist drilling. The drill size chart below …

Find all the essential information you need for your drilling projects in this free drill bit letter chart. This convenient reference document provides drill size, diameter in inches and millimeters, overall length, and carded part number for each lettered drill bit size.

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Values for fractional size, wire gauge size, letter size, metric size, and decimal inch size drills

The chart for lettered drill sizes. The chart below will show you the drill bit sizes of all the lettered drill bits from A to Z. In the second column the letter drill sizes in inches are given.