This all-metal prevailing torque hex lock nut features a built-in locking mechanism that helps prevent loosening caused by vibration or mechanical stress. Manufactured to DIN 6925 and ISO 7042 standards, it's made from property class 8 steel and designed for use with bolts and screws of property class 8.8 or lower. The metric thread is produced to 6H tolerance and tapped after hot-dip galvanizing, which means the thread itself is not zinc-coated. For proper fit, mating external threads must be manufactured to 6az tolerance prior to galvanizing—corrosion resistance is maintained through the zinc coating on the mating part.