![]() ![]() ![]() The most commonly used drill bits are numbered from 1/64 of an inch to 1/2 of an inch. Drill bit typeĭrill bits come in a variety of sizes and shapes, and knowing the correct size for the job is essential for successful drilling. When selecting a drill bit size, it is important to consider the material being drilled, the type of hole being drilled, and the size of the hole needed. For instance, a 1/16″ drill bit is suitable for drilling through thin sheet metal, while a 1/2″ bit would be needed to drill through a thick piece of wood. The most common drill bit size is determined by the material and the job. Each type of drill bit is designed for a specific purpose and is best suited for certain materials. Some of the most common drill bit types are: twist drill bits, spade bits, forstner bits, masonry bits, auger bits, and step drill bits. What is a Drill Bit?Ī drill bit is a cutting tool used to create cylindrical holes in a variety of materials, including wood, metal, plastic, and stone. By the end of this guide, you’ll be an expert on how to measure drill bit size. We’ll explain the different methods of measurement, what tools you’ll need, and the most accurate measurements for different types of drill bits. Pilot hole in hardwood for #24 wood screw.Ĭlose fit clearance hole for 5/16″, M8 screws.Are you looking for an easy guide to help you figure out how to measure drill bit size? If so, you’ve come to the right place! This guide will provide you with the information you need to accurately measure the size of your drill bit and determine the right size for your project. 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.
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