Letter size drill bits chart2/4/2024 The wire gauge number ranging from 107 to 1 and letters ranging from A to Z. 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. Tap, Fractional Drill Bit, Number Drill Bit, Letter Drill Bit.Drill Bit Size Chart Legend: Fractional Inch (1/X') Letter Drill Sizes (A-Z) Millimeter Std Sizes (0.5-25). Tap Drill / Common Uses: Drill Sizes up to 1' Diameter. They are loosely based on the Stubs Steel Wire Gauge. Letter Drill Sizes (A-Z) Millimeter Std Sizes (0.5-25) Number Drill Sizes (1-80). Number and letter gauges do not follow a formula or standard increments. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. The decimal equivalents of the diameters are shown in both English and Metric units. 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. The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. Box 125 Casco, WI 54205-0125 USA PH: 92 FAX: 92 ¥ DRILL SIZE CONVERSION CHART Title: Drill Size Conversion Chart Author: ICS Cutting Tools. Lower percentages such as 75 of the thread depth. In our case, the correct tap drill would be the closest to 3.4 mm from below, and that is the 3.3 mm or 0.13-inch tap drill. Smaller sizes will be listed in the drill dimensions chart, but those are rarely encountered in practice. FRACTIONAL SIZES WIRE GAUGE SIZES LETTER SIZES 511 Main Street ¥ P.O. A rule of thumb is that the right tap drill is around 85 for coarse threads and 90 for fine threads which feature a higher number of threads per axial distance. 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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