S Insertion lock nut S (M6) B SUS Aluminum Framing Nuts - Material: Stainless steel, Mass (g): 7, Surface Treatment: With conductive function | MonotaRO Singapore
Locking nuts | Bossard Global
Amazon.co.uk: M6 Self Locking Nuts
Self Locking Nuts – All Metal (DIN980V) - Dinstock
Metal Lock Nuts Metal Self-locking Nut M3 M4 M5 M6 M8 M10 M12-M20 A2 Stainless | eBay
Self Locking Counter Nut | Nut Size | Pal Nuts | Fast Nut | Nuts K - M6-m20 Locking Nuts - Aliexpress
Self-locking hex nut M6 for 520/6 only RHD-models, all years of manufacturing, you need 2 for 1 car | Wallothesch
M6 All Metal Self Locking Nut, Steel Grade 8 DIN 980V Bright Zinc Plated - Orbital Fasteners
Sockets for self-locking nuts GU with external teeth