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Drill size chart – inch and metric | Downloadable PDF. The most comprehensive guide to drill sizes anywhere on the web, with complete charts covering every size in metric, imperial and fractional measurements.
The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. The decimal equivalents of the diameters are shown in both English and Metric units.
Fractional sizes are measured in inches, while metric sizes are measured in millimeters. The drill size chart contains twist drill data for up to 1.0 inches in diameter. For typical mechanical tolerances that are achievable see: Drilling Tolerances Capabilities Chart. ANSI Size Drill Bit Chart.
Metric drill bit sizes define the diameter of the bit in terms of standard metric lengths. Standards organizations define sets of sizes that are conventionally manufactured and stocked. For example, British Standard BS 328 defines 230 sizes from 0.2 mm to 25.0 mm.
The drill bit size chart provides equivalent sizes for letter, metric, wire gauge, and fractional drill bit sizes, allowing the user to select the correct drill bit for their project.
Find accurate conversions between fractional, decimal, and metric drill bit sizes with BestBitsFor.com's Drill Size Conversion Chart.
Metric Drill Bit Sizes. 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. N – 0.1 + 0.02 mm; N – 0.1 + 0.05 mm; N – 0.1 + 0.08 mm; From 1 through 2.95mm, using N from 10 through 29, we get ...