![]() The wire gauge number ranging from 107 to 1 and letters ranging from A to Z. Minimum Diameter of Rivet Shank (D) 3 x Thickness of the Thickest Sheet That is Being Joined. Fractional sizes are measured in inches and metric sizes are measured in millimeters. ![]() In this drill bit size table, standard size drill bits available in several measurement systems, you can find wire gauge number, letter, fractional and metric drill sizes. This chart shows the diameters of letter gauge drills size A (the smallest) to size Z (the largest). ANSI B94.11M-1979 specifies the size standard of straight shank twist drill bits with working length from 1/64 inch to 1 inch in increments of 1/64 inch.ĭrill Size Chart/Table – Drill Bit Dimensions Chart This chart shows the diameters of letter gauge drills size A (the smallest) to size Z (the largest).
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