HIGH STRENGTH HEAVY HEX STRUCTURAL BOLTS A325 A490 Structural bolts are high strength & heavy duty structural bolts that used in steel structures or steel to steel connections in strcutural frame such as steel structure, space frame, buidlings and bridges, etc. The most common seen structural bolts our customers using are ASTM A193, A325 and A490, A307 and they usually work with structural nuts ASTM A563 and washers F436. Ningbo Fastenwell as one of the top 10 structural bolts manufacturer and A325 bolts suppliers in China, we manufacturer and supply entire set of structural bolts and nuts for regular and potential customers. Heavy hex bolts and structural bolts are a mainstay of Fastenwell bolts range, especially ASTM A193, A325, A490, A307, which are mostly required and used in construction projects like space frame, steel structure, tunnel and bridge, railway, oil and gas, as well as wind energy industry. Heavy hex structural bolts offer high strength and durability in these hostile applications. If you are looking for structural bolt suppliers or heavy hex bolt suppliers, please feel free to ask us, we would be happy to support with our expertise.