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-   -   what size hole to drill for 1/2 fittings (http://www.homebrewtalk.com/f51/what-size-hole-drill-1-2-fittings-325550/)

dulavjo 05-01-2012 10:04 PM

what size hole to drill for 1/2 fittings
 
what size hole to drill for 1/2 fittings for my converted beer kegs. I have 1/2 inch fittings for my SS keg and plastic mash tun

stixobutta 05-01-2012 10:10 PM

Standard 1/2" pipe OD is .840". So if your drilling a through hole to attach fitting then a 7/8 hole .875" should do.

pinback 05-01-2012 10:10 PM

A 1/32 less than 7/8 works for me. But it really depends on you fitting. Threads seems to vary by a 32nd or so. I like to keep it tight as possible. So I drill a little, then try it, then drill a touch more until I can get it where it almost threads in.

Bernie Brewer 05-01-2012 10:18 PM

Get yourself a 7/8" holesaw and go to town.

wolfman_48442 05-01-2012 10:36 PM

7/8" will work great.
I did 13/16" and the holes are so tight I couldn't put tape on the threads until the fitting was already through the hole.
No leaks though :D

evandena 05-01-2012 10:53 PM

Wait till you get your couplings. The outside diameter can vary quite a bit by manufacturer, batch, etc. A step bit can allow you some flexibility.

jcaudill 05-02-2012 12:24 AM

Yes - definitely wait. I'd had couplings from one manufacturer to another that have massive variances.


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