What is 1 2 20 Tap Drill Size

The 1/2-20 tap drill size refers to the size of the drill bit needed to create a 1/2-inch by 20-threads-per-inch thread in a piece of material. This is a standard size for many industrial and automotive applications. The tap drill size is determined by subtracting the thread pitch from the major diameter of the thread. The major diameter of a 1/2-20 thread is 0.500 inches (12.7 mm). The thread pitch is 20 threads per inch, meaning that each thread is separated by 0.050 inches (1.27 mm). Subtracting the thread pitch from the major diameter leaves a tap drill size of 0.450 inches (11.43 mm).

What is a 1/2-inch Tap?

A 1/2-inch tap is a tool used to cut threads into a material, such as metal or plastic. It is a type of cutting tool that features a set of threads on its body. When the tap is rotated and pushed into a pre-drilled hole in a material, it cuts a thread into the material. This type of tap is typically used in industrial and automotive applications.

What is the Drill Size for a 1/2 Tap?

The drill size for a 1/2 tap is 7/16 inches. This is the size of the drill bit that should be used to create the 1/2-inch thread in a piece of material.

What Size Hole to Drill for Tapping?

The size of the hole to be drilled for tapping depends on the tap size being used. For example, if using a 1/4-20 tap, the hole size should be drilled to a diameter of 0.234 inches (5.94 mm). The tap drill size can be determined by subtracting the thread pitch from the major diameter of the thread. The major diameter [1] of a 1/4-20 thread is 0.250 inches (6.35 mm). The thread pitch is 20 threads per inch, meaning that each thread is separated by 0.050 inches (1.27 mm). Subtracting the thread pitch from the major diameter leaves a tap drill size of 0.234 inches (5.94 mm).

Conclusion

The 1/2-20 tap drill size is 0.450 inches (11.43 mm). This is the size of the drill bit needed to create a 1/2-inch by 20-threads-per-inch thread in a piece of material. A 1/2-inch tap is a tool used to cut threads into a material, such as metal or plastic. The drill size for a 1/2 tap is 7/16 inches. The size of the hole to be drilled for tapping depends on the tap size being used. For example, if using a 1/4-20 tap, the hole size should be drilled to a diameter of 0.234 inches (5.94 mm).