Steel Hex Nut, Zinc Plated Finish, Class 6, DIN 934, Metric, M2.5-0.45 Thread Size, 5 mm Width Across Flats, 2 mm Thick (Pack of 100): Amazon.com: Industrial & Scientific
M20 x 2.50 Coarse Thread DIN 934 Class 8 Finished Hex Nut Medium Carbon Steel Plain Finish Pk 50: Amazon.com: Industrial & Scientific
Lock Nuts 304 Stainless Steel DIN 934 Hex Nut for M1 M1.2 M1.4 M1.