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Old 09/23/2018, 02:53 PM   #1
hearttx
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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, 03:12 PM   #2
Gorgok
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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:
https://www.amazon.com/Hotusi-Diamon...+hole+saw+45mm

About $10 and no worries.


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Old 09/23/2018, 04:59 PM   #3
lapin
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Use the size recommended by the manufacture.


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Old 09/23/2018, 07:46 PM   #4
mcgyvr
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Yep..Amazon.....buy one....do it...


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Old 09/26/2018, 04:31 PM   #5
Dugthefish
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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, 01:08 AM   #6
laverda
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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.


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