M6 x 1.00 Coarse Thread DIN 985 Class 8 Nyloc (Nylon Insert Locknut) Standard Medium Carbon Steel Black Oxide Pk 1500: Amazon.com: Industrial & Scientific
Carbon Steel Lock Nut, Zinc Plated Finish, Right Hand Threads, Self-Locking/Nylon Insert, Meets DIN 985, M6-1.0 Threads (Pack of 100): Hardware Locknuts: Amazon.com: 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