What designation does a structural bolt made from alloy steel with higher strength carry?

A structural bolt made from alloy steel with higher strength is designated as A490. This designation refers to high-strength bolts that are typically used in structural applications, particularly for steel connections in buildings and bridges. A490 bolts are characterized by their minimum yield strength of 100 ksi, providing significant load-bearing capability.

These bolts are specifically designed to withstand higher loads and are often used in conditions that require enhanced performance, such as in high-strength steel connections. As a result, the A490 designation indicates not only the materials used but also the intended structural application and performance requirements.

In contrast, A325 bolts are also high-strength but have a lower yield strength than A490. A572 refers to a grade of steel used primarily for structural shapes and plates, not for bolts, while A992 is a specification for structural steel shapes used in building construction. Therefore, the A490 designation stands out for its application in utilizing higher strength steel in bolting applications.