What drill and tap size for 1/4x 1/8" barb fitting

ba_50

Chief Petty Officer
Joined
Apr 4, 2001
Messages
635
It is being used for a vacuum port on a '57 Johnson. It is a Watts #17090192.

Thanks.
 

jonesg

Admiral
Joined
Feb 22, 2008
Messages
7,198
Re: What drill and tap size for 1/4x 1/8" barb fitting

take the barb fitting to the hardware store and find the nut that threads onto the threaded part perfectly, thats your thread size, then just buy the drill/tap pair to suit.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,103
Re: What drill and tap size for 1/4x 1/8" barb fitting

I believe those fittings are NPT which is a tapered thread. You will need an NPT Tap.
 
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