![]() Letter Sizes are Imperial drill bit sizes designated A (smallest) to Z (largest). 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 do not follow a formula or standard increments. reduced as far as possible, so 2/64 becomes 1/32 for instance. The fractions used are always in their simplest form, i.e. Jobber-length drill bits are the most common, with a length somewhere between 9 to 14 times the diameter. They are commonly used to drill lathe centres and spotting drills, i.e.marking holes to guide twist drilling. These specialist drill bits are used for drilling centre holes at two different angles, 60 degrees and 90 degrees. To get an accurate measurement, use Vernier callipers, but be aware that depending on the quality of the drill bit, there could be a tolerance error of between 5 and 15 thousandths of a unit.Īnother example of a metric set of drill sizes is the Renard series, which uses a simple factor to determine the diameter: 1 The R5 series uses a factor of 1.58 and contains the following sizes: M2.5, M4, M6, M10, M16 and M24 2 The R10 series uses a factor of 1.26 and contains the following sizes: M3, M5, M8, M12, M20 and M30 To measure the diameter of a drill bit, it’s best to measure the cutting edge rather than the shank (the shank is the part that is held by the drill chuck). How to measure the diameter of a drill bit? There are a variety of standards used to define drill sizes, the most common one in the UK is the British Standard BS 328 set which includes twist drill bit sizes between 0.2 mm and 25 mm. Thus, drill bit #6 is on the larger side of your standard drill set. What size is a #6 drill bit? Numbered drill bit gauge sizes range in ascending order from 80 (smallest) to 1 (largest). The numbers usually range from 1 to 20 (or more) with 1 representing the least amount of torque and 20, the greatest. For example, the markings may read: 1/4-inch, 3/6-inch or 25/32.Ī normal M6 screw is a rattly fit in a 1/4 BSF full nut.īody Size MetricNearest Imperial Equivalent SizeM4-8-36M5-10-32M6-1/4-28M8-5/16-184 more rowsĩ.53 mmConversion table inches to mmDimensions - Inches to Metric0.375”3/8”9.53 mm0.438”7/16”11.13 mm0.500”1/2”12.70 mm0.563”9/16”14.30 mm21 more rowsĪs mentioned at the beginning of the article, the numbers on a drill represent the amount of torque the tool can apply to an object (such as a screw) or for hole drilling. It’s small, but it usually has the drill-bit diameter stamped into the metal the number is written in fractions. If for example if it was too large and as an example here if this was too large you would know if it was too large simply. If for example if it was too large and as an example here if this was tooMoreSo it’s just a quick tip. What size is a 6mm drill bit in standard?ĥ.2mmMetric Tap and Drill Bit Size TableTapMetric DrillUS Drill5mm x 0.84.3mm-6mm x 1.05.2mm-7mm x 1.06.1mm15/64″8mm x 1.256.9mm17/64″13 more rowsĠ:482:17Quick way to determine right size drill bit – YouTubeYouTubeStart of suggested clipEnd of suggested clipSo it’s just a quick tip. These markings are stamped into the metal and may read ¼-inch, 3/6-inch, or 25/32-inch. Typically, drill bits are marked with their size above the threads on the shank. Take these two dimensions to your local hardware store to make your selection.Measure the diameter of the hole on the side of the chuck in inches with a ruler.The chuck size looks something like: 1/4, 3/8, 1/2 etc. Look closely at the chuck on the drill for the engraved numbers.Aircraft-length drills are extended length drill bits that are manufactured in fixed length such as 4, 6, 8, 12, 18, 24-inch bits, rather than proportional lengths.Screw-machine-length drills arethe shortest available standard sized bits. ![]() Jobber-length drill bits are the most common, with a length somewhere between 9 to 14 times the diameter. ![]() Bit sizes are usually printed on the shank of the drill bit. If necessary, bigger bits (5/16-inch, 3/8-inch, 7/16-inch, and 1/2-inch) can be added. Some applications require specific drill bit sizes, but a bit set with sizes ranging from 1/16 inch to 1/4 inch can cover a wide range of tasks around the house and workshop. ![]()
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