5.61. 1. 0.228. 5.79. This chart shows the diameters of number gauge drills size 80 (the smallest) to size 1 (the largest).. Drill Bit Size Charts By Emmanuel Admin • July 19, 2021 Posted in Charts This drill bit size chart provides a list of sizes in several measurement systems, including fractional, metric, wire gauge number, and letter.

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The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from #107 to #1 and then continues from A to Z. The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used. Drill size chart for machining. Filter by fractional, wire gauge, letter, and metric.. Standard metric lengths (from standards like BS 32*) define metric drill bit sizes using this system: For 0.2 to 0.98mm, sizes use N from 2 through 9: N - 0.1 mm. So for N = 2, it's 2 - 0.1, etc. From 1 through 2.95mm, using N from 10 through 29, we get: For 3 through 13.9mm, with N from 30 to 139: For 14 through 25mm, and N from 14.