300pcs) DIN 6923 M8 Hexagon Flange Nuts Without Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP6923408: Amazon.com: Industrial & Scientific
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(1000pcs) DIN 6923 M4 Hexagon Flange Nuts with Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP692344: Amazon.com: Industrial & Scientific
Amazon.com: 50 M6-1.0 Hexagon Flange Nut - Non Serrated Class 8 Zinc. DIN 6923 / ISO 4161 : Industrial & Scientific