Amazon.com: 10 M12-1.75 Hex Flange Nut, Class 10, Serrated, Black Oxide. DIN 6923 : Industrial & Scientific
600pcs) DIN 6923 M6 Hexagon Flange Nuts with Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP692346: Amazon.com: Industrial & Scientific
M4 Flanged Hex Nuts (DIN 6923) - Black 316 Stainless Steel: Accu.co.uk: Nuts
Amazon.com: FullerKreg (Pack of 20) M6 x 1.0 A2 Stainless Steel DIN 6926 Hex Flange Nylon Insert Lock Nuts, 18-8 Stainless Steel 304, Bright Finish : Industrial & Scientific