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This modified geometry is often referred to as heavy hex geometry. These bolts use the same material as their common cousins ( ASTM F568M for metric bolts), but have a thicker and wider head to more effectively distribute the load. The standard states that the bolts must be tightened to at least 70% of the tensile yield strength.
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These types of bolts are designed to be tightened to near their proof strength, in order to create significant bolt tension. Mechanical properties Mechanical properties, imperial X: A bearing type connection where the threads are not on the shear plane.N: A bearing type connection where the threads are on the shear plane.There are also three connection types defined: Note that independent of the material the bolt is quenched and tempered. There is also a T version, which is used to refer to fully threaded bolts. Type 2: Low carbon martensitic steel (withdrawn from the standard in 1991).Type 1: Medium carbon steel, boron steel, or medium carbon alloy steel.The standard currently defines two types, however it previously defined the following three: The type refers to the type of material used to make the bolt. In 1951, A325 bolts were recognized as equivalent to a hot driven ASTM A141 rivet. To minimize confusion, bolt head markings are unchanged and the designation A325 is retained as a grade name within the new standard.
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In 2016, ASTM officially withdrew specification A325 and replaced it with ASTM F3125. This is a standard set by the standards organization ASTM International, a voluntary standards development organizations that sets technical standards for materials, products, systems, and services. It defines mechanical properties for sizes M12–36. The equivalent metric standard is ASTM A325M, which is titled Standard Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1⁄ 2 to 1 + 1⁄ 2 inches (13 to 38 mm) in diameter. ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength.