![]() For example, a 6.5mm drill bit has a cutting edge with a diameter of 6.5 millimeters. Metric drill bit sizes are typically specified as a whole number followed by a decimal fraction. Metric drill bit sizing follows a similar concept but uses millimeters as the unit of measurement. Wire gauge sizing, on the other hand, uses a numerical system ranging from 1 to 80, with lower numbers representing larger drill bit sizes. For example, a 1/4-inch drill bit can be also specified as 0.25 inches in decimal sizing. Decimal sizing uses the decimal equivalent of the fractional size. ![]() In addition to fractions, drill bit sizes can also be specified using decimal or wire gauge measurements. The smaller the fractional size, the smaller the hole the drill bit will create. Similarly, a 1/2-inch drill bit has a cutting edge with a diameter of 1/2 inch. For example, a 1/4-inch drill bit has a cutting edge with a diameter of 1/4 inch. In the inch-based sizing system, the drill bit diameter is determined by its fractional size. Each type of drill bit may have its own sizing system, but the concept of diameter remains the same. Some of the commonly used drill bits include twist drills, spade drills, hole saws, and brad point bits. To understand drill bit sizing, it is important to know that there are different types of drill bits, each designed for specific applications. In most cases, drill bit sizes are specified in fractions of an inch, such as 1/8, 1/4, 3/8, and so on. However, metric measurements are also used in some countries and industries. The most common unit of measurement used for drill bit sizing is the inch. In this article, we will explore how drill bits are sized in terms of diameter and provide an in-depth understanding of the sizing system.ĭrill bits are typically sized according to the diameter of their cutting edge or the hole that they create. When selecting a drill bit, it is important to consider its size, as this will determine the diameter of the hole it creates. They are used to create holes in various materials such as wood, metal, plastic, and concrete. How are drill bits sized in terms of diameter?ĭrill bits are essential tools in woodworking, metalworking, and many other applications.
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