Foundation bolts or anchor bolts are fasteners used to firmly fix buildings, machines or other structures to concrete foundations. Generally, there are fixed anchor bolts, movable anchor bolts and expansion anchor bolts, etc. Common materials include carbon steel, stainless steel, etc. The thread specifications range from M5 to M48, and the length can range from a few millimeters to hundreds of millimeters to meet different size requirements. The surface treatment is blackening, electrogalvanizing and galvanizing. It plays an important role in many industries. Haina's products are diverse in specifications and undergo strict quality control to meet various needs.