Cooling 9/16 thread tapping

Ive got a number of dd hi-fow barbs that are being wasted and am wondering where i could purchase some tapping bits (is that what they are called?) to make my res and dcc plexi top suitable for 9/16 thread barbs (i.e. the dd high flow ones).

Ay you can tell, i dont know much about what im doing so any pointers would be appreciated (do i tap with a hand drill?)

 

http://www.tapdie.com/html/taps__metric_taps__bsw_taps__b.html seems a good link.

 

thanks for the reply mate.

they have a 9/16 tap, in many diffferent flavours - help!

 

Coolermeister will almost certainly know on this one

 

Definitely DO NOT try tapping with a drill.
You may have to drill out your existing barb holes (1/2" is the correct starting size for a 9/16-18 thread).
Then tap the holes by hand.
Dishwashing detergent makes a good lubricant when you're tapping plastics but you have to clean the tap after so it doesn't rust.

 

Well you need a 9/16-18 tap (18tpi, 9/16" dia); it's a standard fine-thread bolt size (at least in the states). I think the one you want is in the UNF section of the page linked to above.

Which reminds me... I still need to get some BSP taps. You just can't find the darned things in the states.

 

ebay

 

Mcmaster has a few if you search for "NF Taps".