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Tap size for a 1/4 inch air fitting?

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by david
(mooresville nc USA)

What size tap is used to tap a hole for a 1/4 inch air fitting?

Photo of a 1/4" tap
Photo of a 1/4″ tap


Tap fitting size?
by: Bill

Hmmm, not trying to be funny here. I would just select a 1/4″ NPT tap for a 1/4″ NPT fitting thread.

Or am I missing something in your question, David?


1/4 inch tap
by: Buster

I agree with you Bill, haha.

He may have meant what drill bit size he needs to tap a 1/4 inch NPT thread, which would be 7/16″.

1/4 inch pipe quick connects can have different sizes of connections for different sizes of pipes, from 1/8″ pipe up to 3/4″ pipe thread with the most common being 1/4″ NPT.

Just a thought!!

Have a great day David!!!


By Bill

If you google tap / drill size you’ll find many charts. Here’s one: https://www.lincolnmachine.com/tap_drill_chart.html .

By Bill Wade

About Air Compressors has been helping folks with their Air Compressor Problems since 2002 online. We're a community of DIY and Compressed Air professionals who are keen to support everyone across the globe with their air compressor issues and troubleshooting. Whether you're trying to identify an old air compressor, or troubleshoot an error code on a sophisticated new industrial air compressor - the community at About-Air-Compressors.com is here to help you

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