1200pcs) DIN 982 M4 Self-Locking Hexagon Nuts, High Type A2 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP098224: Amazon.com: Industrial & Scientific
M4 x 0.70 Coarse Thread DIN 985 Class 10 Nyloc (Nylon Insert Locknut) Standard Medium Carbon Steel Zinc Plated Pk 100: Amazon.com: Industrial & Scientific
Amazon.com: MonsterBolts - M5 Nylon Insert Lock Nuts, DIN 985, Alloy Steel, Black Oxide, 10 Pack : Industrial & Scientific