![]() They typically indicate the diameter in fractions. Typically fractional drill bit sizes in masonry drilling are indicated by small markings on the drill bit’s threads. For example, a #7 bit is 0.2010 inches in size, which is equivalent to three sixteenths or thirteen/64 in fractional measurement. However, the size of a fractional drill bit will have a major impact on the overall drilling job. A fractional bit of one inch will be equivalent to the next larger fractional size of the same drill bit. In fact, fractional drill bits are used for tapping purposes. Typically, fractional drill bits are smaller than their metric counterparts. You can also buy a high-quality drill bit set from a drill store that sells screwfix masonry bits. While they are not as durable as masonry drills, a good drill bit set should contain more than one common size drill bit.įor maximum safety, always wear a dust mask and always use a protective respirator to protect your lungs from fine particulates. ![]() These tools are compatible with both hand and power units. Some manufacturers use letters to specify the size of the bit, as well.ĭepending on the material and application, there are drill bits that are designed for wood, while others are designed to drill through tougher materials such as masonry. Drill bit manufacturers also use fractions of an inch to specify the size of the bit. Typical fractional drill bit sizes in a masonry drilling project are 1/8, 3/8, and 5/16 inches. Occasionally, specialty fasteners will require bits that are not available in standard sizes. This chart includes the standard sizes of drill bits in a variety of diameters. A typical fractional drill bit size chart is provided below for reference. A 29-piece drill bit set is ideal for a variety of disciplines. Typical fractional drill bit sizes in masonry drillingĭepending on your project, you may need to use bits that range from 1/64 to 1/64 inch. It’s a good idea to read the metric size of the drill bit before you purchase it. Metric drill bit sizes have many advantages over imperial drills, including more precise hole sizing.įurthermore, you can purchase metric drill bits even in the U.S., and many are listed on packages as metric sizes. For this reason, designers generally want the size of the drill bit to be within 10% of the arbitrary hole size.ĭespite the differences in measurement systems, metric drill bits are compatible with imperial drills. The smaller size corresponds to a smaller tolerance for the drilled hole’s diameter. The British Standard BS 328 specifies 230 sizes, ranging from 0.2 to 25.0 mm. Likewise, standard sizes are defined by standards organizations. Typically, a metric drill bit size is defined by its diameter in standard metric lengths. Electrical professionals often use long bit sizes to drill through finished walls to run wires. Typically, fractional bit sizes are used when drilling through very thick materials, such as masonry. ![]() In the imperial system, drill bits are sized in 1/64-inch increments, while metric sizes are based on the diameter of the solid metal shank. Typical fractional drill bit sizes are a result of a standard sizing system. For example, a drill bit size of one inch is described as a “B”. Some sizes overlap, such as 1/8″ or 1/64″. While imperial and metric are the most commonly used measurements, drill bit sizes are classified by size. The difference in metric and imperial sizes between drill bits is more confusing than it seems. But how can you determine which drill bit to use? Listed below are some common differences between metric and imperial sizes. While the differences aren’t significant when drilling wood, they can be convenient in metal drilling. These are slightly smaller than their imperial counterparts, and offer incremental differences in drill diameters. Typically, letter and number bits are smaller than metric and are traceable to nineteenth-century English wire gauges. Similarly, letter gauge drill bit sizes go from “A” to “Z.” The chart below gives the equivalent size in metric and imperial units. Instead, the letters represent the actual size of the drill bit.įor example, the largest letter size is “A”, the next largest size is “B”, and so on. ![]() They are not the same size as their metric counterparts. Typical fractional drill bit sizesĭrill gauge sizes in North America are denoted by letter or number sizes. Depending on your needs, you may want to try drilling a few samples of each before you make your decision. The fractional sizes are the most commonly used in masonry drilling, rotary hammer drilling, and rotary core drilling. Listed below are the typical fractional drill bit sizes. If you are considering buying drill bits for your project, you will need to know which ones are metric and which are imperial.
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