China heavy hex manufacturers ASTM A490 METRIC HEAVY HEX BOLTS ITEM: STANDARD SPECIFICATION FOR HIGH-STRENGTH STEEL BOLTS,CLASSES 10.9 , FOR STRUCTURAL STEEL JOINTS [METRIC] MATERIAL: MEDIUM CARBON ALLOY STEEL DIMENSION: ASME B18.2.3.7M HEAVY HEX STRUCTURAL BOLTS FINISHING: BLACK HOT DIP GALVANIZED Structural Bolts are a specialized heavy type of hex bolt intended for use in large structures, such as buildings and bridges. This bolt is designed to withstand the loads of steel-to-steel structural connections. Hex Bolts also have a shorter thread length so that the threads can be eliminated from the shear planes of the connection. The bearing surface of structural bolts are flat and washer faced and the point is chamfered. High quality steel is used for strength and durability on structural Bolts. The quality of our products is well known throughout these industries. You can always trust the superb quality of our Heavy Hex Structural BoltsChina heavy hex manufacturers website:http://www.hualongfasteners.com/heavy-hex-bolts/