Hex nuts with flange and locking teeth, pack of 10, M8 & M10, flange nuts, DIN 6923-304 stainless steel, non-slip hex nuts, stainless steel : Amazon.de: DIY & Tools
300pcs) DIN 6923 M8 Hexagon Flange Nuts Without Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP6923408: Amazon.com: Industrial & Scientific
Amazon.com: 10 M12-1.75 Hex Flange Nut, Class 10, Serrated, Black Oxide. DIN 6923 : Industrial & Scientific