100 pcs) Metric DIN 6923 M12X1.25 Hex Flange Nut Steel Class 8: Amazon.com: Industrial & Scientific
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.co.jp: 5 M14-1.5 六角フランジナット - 非鋸歯クラス10亜鉛 DIN 6923 / ISO 4161 : DIY・工具・ガーデン