ANSI/ASME B94.11M-1993ĭrill Bits, also called Twist drills are available with straight or tapered shanks though the most common drill bits will have straight shanks. In general, there are 3 categories of common imperial drill sizes: fractional (in 1/64' increments), lettered (A-Z), and numbered (1-80). ISO (Metric Size Drills) & Conversion to Inchesįractional and Metric Sizes per. The cutting tools used for hole-making are available in standard sizes that can be as small as 0.0019 inches and as large as 3 inches. These drill sizes are readily available OTS. The drill size chart contains twist drill data for up to 1.0 inches in diameter.įor typical mechanical tolerances that are achievable see: Drilling Tolerances Capabilities Chart ANSI Size Drill Bit Chart Fractional sizes are measured in inches, while metric sizes are measured in millimeters. ANSI/ASME B94.11M-1993 below are the standard size drill bits used and readily available in industry. Reaming helps control hole size but is not required.Machinist Drill Bit Size Table | Drill Bit Size Chart | ISO Metric Drill Bit Size TableĪNSI and ISO Twist drill size chart Fractional and Metric Sizes per.
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