This line of products was developed for construction machinery customers, has been serialized production, and is fully stocked. Thread specifications are M10, M8, M6, riveting range is 3.0-4.5,4.5-6.0,6.0-8.0,8.0-10.0,10.0-12.0, material is ML08, performance meets GB/T17880.0-1999. The trivalent blue and white coating is adopted.