S.3589 Self Locking Nut, Size: M6 x 1.00mm (Din 985) Metric Coarse: Amazon.com: Industrial & Scientific
Amazon.com: MonsterBolts - M6 Nylon Insert Lock Nuts, DIN 985, Alloy Steel, Black Oxide, 25 Pack : Industrial & Scientific
M6 x 1.00 Coarse Thread DIN 985 Class 10 Nyloc (Nylon Insert Locknut) Standard Medium Carbon Steel Zinc Plated Pk 100: Amazon.com: Industrial & Scientific