What type of connections are A325 bolts primarily used for?

A325 bolts are primarily used for high strength connections in structural steel applications. This is due to their ability to withstand significant loads and stresses, making them suitable for critical structural components that require robust fastening capabilities. These bolts are designed to provide higher tensile strength than standard bolts, which is necessary in situations where structural integrity is paramount, such as in bridges, high-rise buildings, and other heavy construction projects.

Their specification under ASTM A325 indicates that they are intended for use in preloaded bolted joints, which involves high-strength requirements to ensure that connections remain tight under varying loads and to maintain structural stability. The application of A325 bolts in high strength connections contributes to the overall safety and durability of the structure, as they can handle the forces applied during normal use and during extreme conditions such as wind or seismic activity.

Other options reference types of connections that do not require the high load-bearing capacity that A325 bolts provide; hence, they would not be an appropriate use for A325 bolting.