![]() You can measure 1/16″ to 1/2″ range of drill bits using that gauge. As for me I use this gauge to quickly identify the drill bit size in inches and millimeters. Fractionĭrill Bit Sizes in inches and mm table Measure Drill Bit Size You can see fractions, inches, and mm values for each drill bit size here. Drill Bit Size Chartīy following the above method, this table has been prepared with available drill bit sizes. The below table will introduce you to the fractions and decimals of the inches with mm. So we have to interchange the metric units and imperial units. However, standard fractional drill bits come in intervals of 1/64 inches. For typical mechanical tolerances that are achievable see: Drilling Tolerances Capabilities Chart Fractional and Metric Sizes per. The drill size chart contains twist drill data for up to 1.0 inches in diameter. Inches are really popular in the USA but, beyond that, mostly used SI units. What is a number 6 drill bit 6 drill bit 0.2040 inches 0.2040 decimal as a fraction is 51/250. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. ![]() You can multiply by 25.4 of inches value when you convert that to mm.Įx – 0.5 inches = 1/2″ = 0.5 inches × 25.4 = 12.7mm When you measure drill bit size in inches, you can convert it into mm using this method. Fractional Inch Letter Drill Millimeters Number Drill Millimeters Inches Designation Tap Drill/Pilot Drill Uses. Hence measure it as much as possible accuracy. Practically, you may not be able to measure the drill bit diameter more than 2 decimal places. You can check fraction and decimal conversion using the below table. Thus, to convert a 21 drill bit to millimeters, you simply multiply the decimal inches by 25.4 like so: 0.1590 inches x 25.4. After that they run in 1/32 increments up to 2 1/4, then in 1/16 increments to 3, 1/8 increments to 3 1/4 inches, then there’s a 3 1/2 size. 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. There are 25.4 millimeters (mm) in an inch. Fractional-inch sizes are in common use in the US and generally run from 1/64 inch up to 1 3/4 inch in 1/64 increments. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. When drill bit diameter size is available in mm it can convert into inches easily. Below we converted the fractions to decimals so you can compare more easily: 5/32 0.15625 inches. These drills are usually shorter than the standard six-millimeter ones.Drill Bit Size Conversion Methods 1. Another type of drill is the parallel shank drill. They’re usually made of Morse taper material and are available in progressive and fixed lengths. These are the most common lengths for these drills. ![]() They were originally used to make riveted aluminum aircraft. There are three sizes of aircraft-length drills: four, six, eight, and twelve-inch lengths. This makes the 6mm drill bit the perfect size for most projects. Therefore, a size 7 16 screw (7 16 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches. If you have a six-millimeter bit, you’ll be able to drill a hole about 16 inches in diameter, whereas a 16-inch hole will need 64 beads. Example (inch, coarse): For size 7 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch 14 is considered coarse), 0.437 in × 0.85 0.371 in. ![]() Drill sizes are also written as irreducible fractions, such as 1 7/32 inch, so it’s easier to compare sizes than try to guess.Ī drill bit that has a diameter of 6mm is equivalent to the B bit of 0.2380″ or the fifteen-sixth of an inch. This will show you how big a 6mm bit is in inches and other measurement units. However, standard fractional drill bits come in intervals of 1/64 inches. A drill bit that has a diameter of 6mm is equivalent to the B bit of 0.2380 or the fifteen-sixth of an inch. Drill Bit Size Gauge (no.) (inches) (inches) (mm) 104: 0.0031: 0.079: 103: 0.0035: 0.089: 102: 0.0039: 0.099: 101: 0.0043: 0.109: 100: 0.0047: 0.119: 99: 0.0051: 0. By following the above method, this table has been prepared with available drill bit sizes. We start by displaying drill bit Number 10 in decimal inches as follows: 10 drill bit 0.1935 inches. How Big is a 6mm Drill Bit in Inches? If you’re looking to buy a drill bit, but don’t know the exact size, it’s best to use a chart. The purpose of this page is to give you an alternate drill bit (approximate equivalent) to drill bit gauge size Number 10 (10).
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