I have some threaded 1/8" zerk fitting that I want to use, thread is 1/8-27 npt. A 1/8-27 npt tap is larger than my zerk, so it needs to be smaller. I checked my 25th edition of Machinery's Handbook but didn't find an answer. I did seen a tap on the Grainger site (https://www.grainger.com/product/IRWIN-HANSON-Tap-...) that looks like it be correct, but I haven't called them yet. Anyone know of a tap, or if this one is what I'm looking for? And what drill would be appropriate?
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