Details about 8-32 tap drill, 10-32 tap drill, 6-32 tap drill, and 6-32 drill size are mentioned here. The wire gauge number ranging from 107 to 1 and letters ranging from A to Z. The tap size chart on this page is the list of standard size drill bits in different measurement systems that include fractional, metric, wire gauge number, and letter. 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. 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 Fractional-inch drill bit sizes: the drill bit sizes are written as irreducible fractions.MIL-S-8879 was primarily thought of an used for aerospace fastener and threaded component applications. It was derived from a military specification (MIL-S-8879) originally published in December 1965. They are loosely based on the Stubs Steel Wire Gauge. The UNJ thread standard (ASME B1.15) defines a system of threads for highly stressed applications requiring high fatigue strength. Number and letter gauges do not follow a formula or standard increments. Number and letter gauge drill bit dimensions are often used for twist drill bits rather than other drill forms, and are still in common use in the U.S. Smaller sizes will be listed in the drill dimensions chart, but those are rarely encountered in practice. Number and letter gauge drill bit sizes: the number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest).
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