These stainless steel acorn nuts combine a hex body with a closed dome, so a stud end is covered rather than left exposed. The hex dome cap nuts shown here are polished to a mirror finish in 304 and 316 stainless steel, in sizes from M3 to M20, with coarse and fine pitches listed per size. Because the dome closes the end, the thread is shielded from dust and the joint gets a rounded, snag-free appearance. Buyers who specify 304 stainless steel cap nuts usually cover indoor and general outdoor work, while 316 is chosen near salt water and chlorides. Height, across-flats, pitch, finish, marking and packaging can be customized.