MonsterBolts - M4 Nylon Insert Lock Nuts, DIN 985, Alloy Steel, Black Oxide, 10 Pack: Amazon.com: Industrial & Scientific
Qty 10pcs) M7-1.0 Metric Nylon Insert Lock Nut Steel Din 985 M7x1.0 7mm x 1.0 Hardware Fastener Kit Set RV2322S: Amazon.com: Industrial & Scientific
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