Self-locking hex nut DIN 985 in Stainless steel V2A (AISI 304)—with a Polyamide locking element to prevent accidental loosening. For connections subject to vibration, shock, and alternating loads, such as on gates, machines, and railings. Available in thread sizes M4 through M12; can be installed without additional parts. The clamping element holds the nut securely in place—even where a simple locknut reaches its limits.