Name：A490 Heavy Hex Structural Bolts

Typical Material：   Alloy Steel 
Material and Mechanical Properties：  ASTM A490 Type 1 
Dimensions：   ASME B18.2.6 
Typical Hardness：   HRC 33-39 on sizes 1/2 to 1 inch less than 2D in length and HRC 39 max 2D and greater in length;HRC 33-39 on sizes 1-1/8 to 1-1/2 inches less than 3D in length,HRC 39 max 3D and longer lengths. 
Tensile Strength：   150,000 PSI min to 173,000 PSI max