I need to thread a 1/4 bsp (M12) into a 4mm thick aluminium end plate. The working fluid is water at 90 degrees celsius. Is the end plate thick enough to adequately seal the flow or should I consider welding a cylindrical extrusion onto the plate?
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The thickness would depend on both the temperature and pressure the plate must withstand. – Fred Jul 18 '22 at 12:21
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Weld a boss onto the plate, or you could make a nut to go on the back if the fitting has a flange.
A nut can be made from aluminium: use hex bar stock either accept the size or machine / file to the size desired and drill then tap the hole.
Solar Mike
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