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View Full Version : Drill vs bulkhead sizing



Murfman
09-20-2011, 04:40 PM
Bulkhead----Diamond coated drill size------mm
3/4"--------------1 1/2"--------------------------38
1"----------------1 3/4"--------------------------45
1 1/2"------------2 1/2"-------------------------64
2"------------------3"-----------------------------77

With the metric sizing, you can always go a little bit bigger on the drill bit. This is all for Schedule 40 bulkheads.


http://mg-jewelry.com/mmtoinches.html

notchback5.0
09-21-2011, 08:11 AM
good info paul.

+1 on slightly larger is ok. I used a 39mm for my 3/4 bulk heads. My 1 inch hole saw is a 45mm.

Levi
11-06-2013, 11:57 AM
+1 great post Paul. The reason I have so many sizes is I kept ordering too small and had to get the next size up lol

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greaseballpaul
11-06-2013, 05:41 PM
Very cool. I was just asking about this the other day. Thanks!

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