Which bolt type is known as a "soft" bolt used generally in static load structures?

The A307 bolt type is designated as a common type of "soft" bolt, typically used in applications involving static loads. This designation indicates that A307 bolts are made from a lower-strength material compared to other bolt grades, making them appropriate for use in non-critical applications where the loads do not require higher-strength fasteners. They are often utilized in structures that are not subjected to dynamic loads or high-stress conditions, such as in many general construction scenarios and connections.

In contrast, other bolt types like A325 and F593 are designed for higher strength and may be utilized in applications that experience greater stresses or dynamic loading conditions. F436, meanwhile, refers to a type of washer, rather than a bolt. Understanding the appropriate application of these various bolt types helps ensure the structural integrity of projects in ironworking.