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What Size Drill Bit Do You Use For a 1/2 Inch Tap?

What Size Drill Bit Do You Use For a 1/2 Inch Tap? photo 0

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To tap a pipe with a 1/2 inch diameter, you must first decide on the thread pitch and diameter. The thread pitch is the number of threads per inch in the pipe. For instance, a 1/2 inch – 20 tap has twenty threads per inch. The diameter of the hole should be at least 23/32″ so that the threads will fit snugly. For other threads, you can use a smaller drill bit.

What Size Drill Bit Do You Use For a 1/2 Inch Tap? photo 1

Then, choose the right tap drill size for the tap. There are two types of taps: metric and non-metric. Metric threads require a drill bit with a major minus pitch of about 0.1, which will give you a good tap drill diameter of around 1/2 inch. To convert into metric threads, you can divide the number of threads per inch by 1/13, which gives you a value of 0.077 inches.

What Size Drill Bit Do You Use For a 1/2 Inch Tap? photo 0

A tap size chart will list standard tap sizes, including diameter and thread spacing. It will also show decimal equivalents in English and metric units. For example, a fractional size is listed in inches, whereas a metric one is shown after the letter ‘M.’ Both units will have their decimal equivalents in English. In addition to tap sizes, you should also take into account the diameter of a screw.

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