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.
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