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Q: What is the tap drill size for a 120-80 thread?
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What drill bit size for .125 in. national pipe thread?

Use 7/64 as tap drill and 9/64 as clearance drill


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For a cut tap the correct drill size is a #17 drill, which has a diameter of .173 inches.


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What size drill bit for a three quarter tap?

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What size drill bit should you use to drill a hole that is threaded for a 1by4-20 UNC bolt?

Your meaning is not clear. - If you are going to tap the threads in, use a 7/32 drill bit. If you want a hole that this bolt will slip through, use a 9/32 drill bit.


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How do you determine the drill size for tapped holes?

Google "tap drill sizes" and you'll get 19400 results. The formula for that calculation is searchable in Machinery's Handbook, but there are simple charts you will get in your search that can give you the answer for any size you need to know.


How long does it take to drill and tap a rifle?

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How can you re-thread a cast iron cleanout in slab?

Get a TAP the size of the CO opening