Snarley Bill Posted January 2, 2011 Share #1 Posted January 2, 2011 i need to know what size tap drill a 1/4 " npt tap takes. can't find my machinist book and can't remember what size it takes. Link to comment Share on other sites More sharing options...
Zane Posted January 2, 2011 Share #2 Posted January 2, 2011 http://www.engineershandbook.com/Tables/npttap.htm Snarley Bill, Here it is. Link to comment Share on other sites More sharing options...
skydoc_17 Posted January 2, 2011 Share #3 Posted January 2, 2011 Hey Bill, The Tap Drill for a 1/4"-18 NPT is a 7/16". Happy New Year, my friend. Earl Link to comment Share on other sites More sharing options...
Zane Posted January 2, 2011 Share #4 Posted January 2, 2011 Hey Bill, The Tap Drill for a 1/4"-18 NPT is a 7/16". Happy New Year, my friend. Earl Boy you sure are quick on the draw! LOL Link to comment Share on other sites More sharing options...
skydoc_17 Posted January 2, 2011 Share #5 Posted January 2, 2011 Hey Zane, Needless to say, I have Tapped a few holes in 38 years as a CNC Machinist. I just happened to know that one off the top of my head. That was a very nice chart you provided the forum Zane, I am sure more than a few mwmbers will be bookmarking that page. Ya' done good there. Earl Link to comment Share on other sites More sharing options...
Zane Posted January 2, 2011 Share #6 Posted January 2, 2011 Hi Earl, Long time no hear from ya! I am always amazed how many questions are answered by just doing a simple copy text and "Google It" search! BTW, I'm sure you are aware that your rectifier is on the way. Should be there tomorrow or Tuesday at the latest. See attachment for tracking number on the email. Best to you. Link to comment Share on other sites More sharing options...
Venturous Randy Posted January 2, 2011 Share #7 Posted January 2, 2011 Just so everyone knows, this is for pipe thread. RandyA Link to comment Share on other sites More sharing options...
Snarley Bill Posted January 2, 2011 Author Share #8 Posted January 2, 2011 thanks guys. got her drillled and tapped. i now have three drain plugs in my new cushman engine. this one i can get to. Link to comment Share on other sites More sharing options...
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