4/11/2024 0 Comments Drill bit sizes in 64ths chartThe drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.Most other countries, especially in Europe, have abandoned them entirely in favor of metric systems. They are also seen in the UK to a lesser degree, having been largely replaced by metric sizes. First chart is for Imperial drill bits and second is for metric sizes. Although they originated in the 19 thcentury, these gauges are still commonly used in the U.S. They are loosely based on the Stubs Steel Wire Gauge, with gauge sizes that are similar (but not entirely identical) to that system. Number and letter gauges for drill bits do not follow a formula or standard increments. 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.Fractional sizes are measured in inches, while metric sizes are measured in millimeters.The second and third columns show the decimal equivalents of the diameters are shown in both English and Metric units.This table is split up into 4 sections as it would make a very long list on the page otherwise.
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