Drill Size For 1/2-13 Tap

Drilling the Perfect Hole for a 1/2-13 Tap
Do you need to drill a hole for a 1/2-13 tap but don’t know what size to make it? If so, you’ve come to the right place. We’ll explain the tap drill size for a 1/2-13 tap – and what to do if you don’t have the right drill bit.

What is a Tap?

A tap is a tool used to cut a thread on the inside surface of a hole, allowing a fastener or bolt to be inserted. Taps come in a variety of sizes, including 1/2-13, which is a common size.

Drill Bit Size for 1/2-13 Tap

The proper drill bit size for a 1/2-13 tap is a #17 (.189 inch). This is known as the “tap drill” size – the hole size that is used to create the thread.

What If I Don’t Have a #17 Drill Bit?

The best way to drill a hole for a 1/2-13 tap is to use a #17 drill bit. However, if you don’t have one, you can use the next size up, which is a #16 (.202 inch). The thread will be slightly looser but still acceptable.

How to Drill a Hole for a 1/2-13 Tap

Now that you know the correct size drill bit to use, it’s time to learn how to drill the perfect hole for a 1/2-13 tap. Here’s what to do:

Step 1: Mark the Hole Center

Measure the center of the hole and mark it with a dot.

Step 2: Drill the Pilot Hole

Using the #17 (or #16) drill bit, drill a pilot hole at the center of the mark.

Step 3: Countersink the Hole

Use a countersink to countersink the hole so the tap will sit flush with the surface.

Step 4: Tap the Hole

Place the 1/2-13 tap in the drill and start tapping the hole. Start slow and go slow.

Conclusion

As you can see, drilling the perfect hole for a 1/2-13 tap isn’t complicated. Simply use a #17 (or #16) drill bit, mark the hole center, drill the pilot hole, countersink the hole, and then tap the hole. Now you know the drill size for a 1/2-13 tap and how to drill the perfect hole for it.

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