1. Brass Lock Nuts – Metric Threads (DIN Standard) (Commonly per DIN 439 / DIN 936 – Brass thin hex lock nuts) Brass Metric Lock Nut Size Chart Thread (M) Pitch (mm) Across Flats (s) mm Thickness (m) mm Typical DIN M3 0.50 5.5 2.0 DIN 439 M4 0.70 7.0 2.2 DIN 439 M5 […]