Using our drill chart that follows below, you’ll get an idea of just how many sizes there are! (And much more when you factor in different types of bits). In fact, most nice sets include anywhere from 12-30 pieces of standard drill bit sizes. Thankfully, we can narrow it down a bit to some standard sized holes and bits.įor example, let’s look at the most common applications:Įveryday home repair and construction projects, hobby, marine, farming, woodworking, metal working, aircraft, arts and crafts, commercial building projects, machinery and more.įor each particular application area, you’re going to just see a few dozen or so relevant drill bit sizes. Well, if you base your answer on how many size holes there are in the world, then there would be infinite amount of bits! If you were to look at the most all encompassing collection of multi-purpose, twist-type bits, how many drill bit sizes would there be? How Many Drill Bit Sizes Are There?įirst things first. Scroll down if you just need a quick reference using our drill chart. We’ll discuss these in detail in this article. Many times, we’re just trying to find out the alternative sizes available if you’re working with metric sizes (measured in millimeters) versus standard or empirical values (our familiar fractional inch variety).Ĭheck out our full drill chart below for a quick reference to find all drill size equivalents.įinally, getting the right size drill bit set in your greater tool “chest” will arm you for the various types of projects you’re doing. It may not be totally evident at first glance. Knowing just what size you need to use for the hole you’re making is also important. Pilot hole in hardwood for #24 wood screw.Ĭlose fit clearance hole for 5/16″, M8 screws.Having the right drill bit sizes on hand for your particular repair or building task is essential for any seasoned carpenter or weekend-DIY’er. Pilot hole in softwood for #24 wood screw. Pilot hole in hardwood for #18 wood screw Pilot hole in softwood for #20 wood screw. Pilot hole in hardwood for #16 wood screwĬlose fit clearance hole for M4, #8 screws Pilot hole in softwood for #16 & #18 wood screw Pilot hole for #9 & #10 wood screw in hardwood.Ĭlearance hole for #5 wood screw Pilot hole in hardwoodĬlose fit clearance hole for #5 screw free Pilot hole in softwood for #12 & #14 wood screw Pilot hole in softwood for #10 & #12 wood screw Ĭlose fit clearance hole for M2.5 screw tap for 6-32. Pilot hole in softwood for #5 wood screw.Ĭlearance hole for #1 wood screw pilot hole in softwoodĬlose fit clearance hole for M2 screw freeįit clearance hole for #1 screw tap for M2.5. Pilot hole in softwood for # 3 & #4 wood screw Pilot hole in hardwood for #0 and #1 wood screw. Pilot hole in softwood for #1 and #2 wood screw Pilot hole in softwood for #0 wood screw. Bits usually come with a 135° split point, although several proprietary designs are also offered. Ideally the point should be suited to the materials to be drilled. Very long twist drills, often called “aircraft drills,” sometimes “electrician's drill,” are available in 6, 12, and even 24-inch lengths. The lengths given in the table below are “jobber's lengths.” For some purposes they are too short. numbers, with higher numbers representing smaller drills.In the United States, three different systems for designating twist drill sizes are used: If you need information on such drills, the most convenient source is the latest edition of Other shanks (namely, taper shanks) and larger sizes are usually used only in an industrial setting. The table below shows the sizes of both U.S. ☙ Share this page on Facebook twist drills
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