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Old 04-12-2009, 10:56 AM
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Tap Hole Sizes?

What size holes need to be drilled to tap these sizes:
1/2" x 20
1/2" Male PT
1/8" NPT
1/4 NPT
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Old 04-12-2009, 11:16 AM
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345desoto,

1. 29/64
2. You do not drill a hole for male threads, just thread the pipe. To thread a hole to fit that pipe drill it with a 45/64
3. Use an "R" drill for this one
4. Use a 7/16 drill on this one

Have Fun

Scholman
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Old 04-12-2009, 01:42 PM
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Here's a good reference chart for tap hole drill sizes:http://www.championscrew.com/machine_screws.htm
You can print it and keep it handy in the tool box. I printed mine on card stock and put it in a document protector sleeve.
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Old 04-12-2009, 01:47 PM
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Thanks, guys...
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