METRIC DOME NUTS A2 STAINLESS STEEL HEAD CUP NUT M3 M4 M5 M6 M8 M10 M12
Also acts as a shield from the end of the thread. Thread pitch 0.5mm. Thread pitch 0.7mm. Thread pitch 0.8mm. Thread pitch 1.0mm. Thread pitch 1.25mm. Thread pitch 1.5mm. Thread pitch 1.75mm.