While the largest drill bit sizes can have a diameter of several inches, the smallest can be as little as 0.05 mm.īetween 1/16 inch and 1 inch are the most popular drill bit sizes, with smaller sizes being utilized for finer work and bigger sizes for more demanding applications. The size of the hole that can be drilled increases with diameter. The diameter of a drill bit, or the distance across the widest point of the bit, establishes its size. Typically, drill bit sizes are expressed in inches or millimeters. can be as small as 0.05 mm, while the largest can be several inches in diameter. Typically, the numerical number falls between 1/4 inch and 1-1/2 inches. Auger drill bits: are used to make deep holes in soft materials like wood.The numerical value usually falls between 1/4 and 1-3/8 inches. Step drill bits: are used to drill holes of various diameters since they have several stepped sizes on a single bit.Typically, the numerical number falls between 1/8 inch and 1 inch. Drill bits for countersinking: screws and other fasteners are known as countersink drill bits.Masonry Drill Bits: These are used to drill through masonry materials including brick, concrete, and more.Typically, the numerical number falls between 3/4 inch and 6 inches. Hole Saw Drill Bits: These are used to drill huge holes in a variety of materials, including metal and wood.Typically, the numerical number falls between 1/4 inch and 2 inches. Forstner Drill Bits: These are used to drill holes with flat bottoms in soft materials like wood.Spade drill bits: are used to make large holes in soft materials like wood because they have a flat, paddle-like tip.Brad Point Drill Bits: These have a pointed tip that helps keep the bit from wandering and are made specifically for drilling into wood.Typically, the numerical value falls between 1/16 and 1 inch. Twist Drill Bits: The most popular kind of drill bits, these can be used to drill into plastic, metal, and wood.Here are a few of the most popular drill bit varieties and their typical numerical values: Types of Drill Bitsĭrill bits come in a variety of forms, each with a unique function and set of characteristics. The fundamentals of drill bit sizes and how to select the appropriate size for your job are covered in this article. Anyone who uses a drill, whether for DIY projects or industrial applications, must be familiar with drill bit sizes. The size of the drill bit influences how big the hole will be, and different sizes are suitable for various materials and uses. Any drilling project must consider the diameters of the drill bits.
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