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-   -   Tap size for 1/4" NPT bolt? (http://www.wakeworld.com/forum/showthread.php?t=780371)

loudsubz 06-07-2010 5:30 PM

Tap size for 1/4" NPT bolt?
I have a drain plug on my exhaust manifold and it uses a standard 1/4" NPT thread on it and small 1/4" bolt that you can buy in any hardware store.

Problem is the hole is all corroded from rust over the years and I need to clean it out.

For the life of me I can't figure out what size tap to use to clean it out. I have tried 7/16 but its a little too small, and the 1/2" taps I have used are 13 and 20 and the 20 seems to work the best but it wont thread on all the way through on a test pipe I have, it only goes about 3/4" in.

Anyone know the correct thread pitch for this?

joesell 06-07-2010 6:17 PM

It's a pipe tap. The threads are tapered.

loudsubz 06-07-2010 7:24 PM

Where would I get that type of tap?

cwb4me 06-07-2010 7:30 PM

snapon .com or a snap-on dealer would have one also maybe home depot or lowes in plumbing.

chpthril 06-07-2010 9:05 PM

You need a 1/4 NPT tap. Do you have a NAPA auto parts store around ya! They should be able to get you one.

dave27 06-08-2010 7:37 AM

orchard supply will have them too.

trace 06-08-2010 7:50 AM

Also Sears or www.mcmaster.com

masonwakerider 06-08-2010 8:05 AM

got one at ace hardware last week

loudsubz 06-08-2010 10:56 AM

gonna check around thanks

lifetimewarranty 06-08-2010 10:57 AM

1/4" NPT tap needs a 7/16 drill

sounds like you need just the tap...

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