Hole size for bar tap?

[Crin]

Can anyone tell me, what diameter is the threaded part of a standard beer tap. I need to know so I can make a support plate for the fridge so it doesn't bend before it arrives.

 

[Cyberjip]

If you mean the shank that the tap connects to it need a a 21mm hole I believe

 

[Graz]

Ever so slightly larger than 22mm, I used a 22mm hole saw on mine and then had to file a little to get it through.