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Compass Marine How To | all galleries >> Welcome To >> Seacock & Thru-Hull Primer/Pre Information > 3/4 Inch Flange Overall thickness at Top Threads
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3/4 Inch Flange Overall thickness at Top Threads

3/4 Inch Flange Overall thickness at Top Threads

In the interest of fairness I also wanted to measure the total wall thickness of the flange, at the top threads, to compare it to the 1" thru-hull nominal wall thickness. I understand I'm not comparing two 1" or two 3/4 inch fittings but the points remain the same and the wall thickness is what I am trying to get at.

This fitting measured an overall thickness of 4.04 millimeters and a thread depth of 1.26mm millimeters. When you subtract 1.26mm from 4.04mm you are left with a total nominal wall thickness of 2.78mm. This makes the thickness, of this 3/4 inch fitting, at the threads, approximately double that of the 1" Apollo thru-hull fitting.

Nikon D200
1/60s f/4.0 at 24.0mm iso100 full exif

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David 15-Jun-2015 21:47
Thank you. I have a wooden yacht that has the wrong thru holes. I will only use Groco thru hulls for now on and change them all out that aren't Groco and correct.
Guest 04-Sep-2013 10:56
Thank you.
Fred - LittleFloater 12-Jun-2011 02:32
Nice job explaining and great photos. Thanks.