1/2-13 Tap Drill Size – Complete Guide

When drilling a hole in a metal part, the size of the drill bit you use is important. If the hole is too small, the bit might break or the part might crack. If the hole is too large, the bit might slip out of the hole or the part might fall apart.

The correct drill bit size to use is determined by the size of the tap that will be used to thread the hole. The 1/2-13 tap drill means you should use a drill bit that is 1/2 inch in diameter and has a 13-threads-per-inch (TPI) drill bit.

What is a Drill Bit For 1/2-13 Tap?

The size of the drill bit you need for a 1/2-inch 13 tap depends on the thread pitch of the tap. The thread pitch is the distance between threads on the tap. For a standard 1/2-13 tap, the thread pitch is 13 threads per inch. This means that there is one thread every 1/13th of an inch.

To find the drill bit size, you need to measure the tap’s major diameter. The major diameter is the widest part of the tap. For a 1/2-13 tap, the major diameter is 0.500 inches. To find the drill bit size, divide the major diameter by the thread pitch. The 1/2-13 tap drill size is 0.422 inches. This drill bit size is for a tap with a standard thread pitch of 13,16, 20 taps. If the tap has a different thread pitch, the drill bit size will be different.

How to Choose a 1/2-Inch 13 Tap?

There are a few things to consider when choosing a drill bit for 1/2-13 tap. The first is the size and type of thread you need to cut. The second is the material the tap will be used on. The third is the chamfer type.

The size and type of thread you need to cut will determine the size of the tap. If you are unsure of the thread size, you can measure it with a thread gauge. The material the tap will be used on will also determine the size. Taps for steel are usually smaller than taps for brass or aluminum.

The chamfer type is the angle of the cutting edges. Taper chamfers are the most common and are used for general-purpose tapping. Plug chamfers are used for blind holes and have a slightly smaller angle. Bottoming chamfers are used for through holes and have the smallest angle.

When choosing a 1/2-Inch 13 tap, you need to consider the size and type of thread you need to cut, the material the tap will be used on, and the chamfer type.

Man in the gloves drilling with a yellow drill

How to Drill with a 1/2-13 Tap Drill

Step 1: Mark the center of your drilling location on the workpiece.

Step 2: Center punch the mark to prevent the drill bit from walking.

Step 3: Drill a pilot hole using a small drill bit.

Step 4: Switch to a 1/2-13 tap drill and drill a hole deep enough to accommodate the tap.

Step 5: Place the tap in the hole and turn it clockwise until it is tight.

Step 6: Back the tap out a few turns to break the chips and then finish tapping the hole.

Man drilling hole in the mini football


What Is the Drill Bit Size For a 1/2 NPT Tap?

The drill bit size for a 1/2 NPT tap is 23/32.

How Do You Calculate the Pitch Diameter of a Thread?

The most common way to calculate the pitch diameter of a thread is to use a thread gauge. This tool has a variety of different-sized holes, each of which corresponds to a specific thread size. To use a thread gauge, you simply align the gauge with the thread and find the hole that the thread fits into snugly. The size of the hole is the pitch diameter of the thread.

What Is Minor and Major Diameter?

The minor diameter of a thread is the smaller of the two extreme diameters, while the major diameter is the larger of the two. The minor diameter is measured across the bottom of the threads, while the major diameter is measured across the top.


When it comes to choosing the correct tap drill size, 1/2-13 is a great option. This size tap is perfect for a variety of applications, including both light and heavy-duty tasks. It is also a good choice for those who need a tap that can handle a variety of materials.

Ronnie Collins

Ronnie Collins

I’m Ronnie Collins. I’ve been passionate about gardening and woodworking all my life and even earned an MS degree in Botany from the University of Maryland. I’ve been working at a gardening company for a while, so I know the ropes about a whole lot of dedicated equipment such as the table saw, track saw, lawnmowers, chainsaws, garden hoses, and much more.

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