Hexagon flange bolt with serrated flange ≈ DIN 6921 M6X16, hot dip galvanized steel 8.8, 200 000 pcs. M6X20, hot dip galvanized steel 8.8, 200 000 pcs. M6X20 zinc-plated steel 8.8 200 000 pcs. DIN 6923 Hexagon nuts with flange M6 Hot dip galvanized steel 8.8 200 000 pcs.