500pcs) DIN 6923 M5 Hexagon Flange Nuts Without Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP6923405: Amazon.com: Industrial & Scientific
Amazon.com: 25 M10-1.5 Hexagon Flange Nut - Non-Serrated Class 10 Zinc DIN 6923 / ISO 4161 : Industrial & Scientific
M5 x 0.80 Coarse Thread DIN 6923 / ISO 4161 Class 8 Hex Flange Nut Medium Carbon Steel Zinc Plated Pk 100: Amazon.com: Industrial & Scientific