Hanger Bolt in solar rack is a key metal fitting used to fix and support solar photovoltaic modules. It has a variety of materials, specifications and designs to meet different installation requirements. There are many types of hanger bolts, such as hanger bolt for wood, hanger bolt for steel, hanger bolt for self drilling, etc. The stud bolts have different strength grades, such as 4.8, 8.8, 10.9 and 12.9, and are widely used in solar racks, construction, furniture and machinery manufacturing.