2/26/2024 0 Comments Drill bit size chart letter![]() In the second column the letter drill sizes in inches are given. The chart below will show you the drill bit sizes of all the lettered drill bits from A to Z. Besides, when you want to obtain maximum thread depth, lettered drill bits are used. Moreover, number and letter sizes are also used for twist drill bits, more than other forms, as their ranges encompass the sizes used more in twist drills. Since they fall in the sizes between those two types, they are used whenever a precision-sized hole is needed to be made. The most common uses for lettered and numbered drill bits are for using taps since you won’t probably find the exact match for fractional or metric sizes, but you can get close to them by using lettered or numbered bits. That is why numbered and lettered drill bits were developed to make up the gaps between these two sizes. ![]() What are letter drill bits used for?Īs we’ve seen, most of the measurement systems followed for drill bits are metric and fractional measurements. In other words, lettered bits are simply the larger versions of the numbered wire sizes. Here A is the smallest and Z is the largest. They are denoted by the letters from A to Z. The numbered ones have gauge sizes ranging from 80 to 1 the number 80 is the smallest while 1 is the biggest. Other than the drill bit sizes mentioned earlier we also have numbered and lettered drill bit sizes. Fractional drill bit sizes, on the other hand, make inch-sized products. Well, the metric drill sizes are defined by the diameter of the bit in terms of metric lengths. What is the difference between these sizes? In nearly all other countries, the metric system sizes are maintained. the measurement system for drill bits is the fractional-inch and gauge bit sizes.
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