hello, i need a few of these " sunken flush nuts " and cant seem to find them anywhere nor do i know what they are actually called. they are on all the acrylic hatc
Those are probably barrel nuts and screws. On delicate materials like plexiglass, the barrel length stops the screw head from applying to much compression of the material causing failure. They are purchased by diameter and material thickness. They are available in aluminum, stainless steel and others. Here is one good outfit that has them. The first link is to aluminum. The second link is to their section of styles.