M3 x 0.50 Coarse Thread DIN 934 Finished Hex Nut Stainless Steel 18-8 Pk 100: Amazon.com: Industrial & Scientific
Amazon | Steel Hex Nut, Plain Finish, Class 6, DIN 934, Metric, M2-0.4 Thread Size, 4 mm Width Across Flats, 1.6 mm Thick (Pack of 100) by Small Parts | 六角ナット | DIY・工具・ガーデン 通販