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Old 09/23/2018, 03:53 PM   #1
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hearttx's Avatar
Join Date: Sep 2016
Posts: 69
Bulkhead hole size.

I am about to drill my tank and I have a question on hole size. I have 1" bulkheads and the recommended hole saw size is 45mm. I have 40mm and a 50 mm saw but not a 45 mm. Has anyone drilled for a 1" bulkhead with a 50mm? Is 5mm going to make that much of a difference? Why not use the 50 mm? TIA!

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Old 09/23/2018, 04:12 PM   #2
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Join Date: Feb 2011
Location: Cypress, Texas
Posts: 1,904
I'd rather have as small holes as possible behind my bulkheads. Less likely to mess something up...

Plus with amazon's cheap stuff and prime you can get something like this:

About $10 and no worries.

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Old 09/23/2018, 05:59 PM   #3
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Location: Austin
Posts: 731
Use the size recommended by the manufacture.

Tank sizes, 2-10's a 55 and one that's about 500gal

Current Tank Info: Interior decorating happening
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Old 09/23/2018, 08:46 PM   #4
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Location: North Carolina
Posts: 18,154 it...

Being blunt and having fun
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Old 09/26/2018, 05:31 PM   #5
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Location: Clear Lake, Iowa
Posts: 26
5mm is like 3/16". Cant really speak for plumbing through glass, but that seems like a reasonable yet slightly large oversize for a 2" hole.

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Old 09/30/2018, 02:08 AM   #6
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Location: Anaheim, CA
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With an oversized hole your putting more load on the outer thinner edge of the bulkhead making it more likely to fail. Get the proper size drill.

240G mixed reef, 29G SPS/LPS clam tank, 50G mixed reef

Current Tank Info: 300g mixed reef, 50g cube
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