Metric Hexagonal Bolt Fine & Full Thread Black Steel M20 * 2 * 80mm Grade 10.9

Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Dimensions meet ISO (formerly DIN) specifications. Length is measured from under the head.

Black steel screws resist corrosion in wet environments. Match the thread spacing of mating components. Fine and extra-fine threads are closely spaced to prevent loosening from vibration: the finer the thread, the better the resistance.