M3 M4 M5 M6 M8 M10 NYLOC NYLON INSERT LOCKING NUTS ⚫ BLACK A2 STAINLESS DIN 985
These are a DIN 985. Further details are as follows Nyloc Nut Across the Flats (A/F) - 5.5mm. Nyloc Nut Height - 4mm. Nyloc Nut Across the Flats (A/F) - 7mm. Nyloc Nut Height - 5mm. Nyloc Nut Across the Flats (A/F) - 8mm.