M3 HEX NUT FULL HEXAGON NUTS DIN 934 STAINLESS STEEL. M3 M4 M5 M6 CAP SCREWS HEXAGON SOCKET HEAD ALLEN KEY BOLTS A2 STAINLESS STEEL. Standard DIN 934. Hexagon steel Nuts are intended to fasten screws and bolts, when used in conjunction to unthreaded holes.
eBay