What is the minimum bolt pretension for a 1 ⅛ inch ASTM A325 HSB bolt?

For a 1 ⅛ inch ASTM A325 high-strength bolt, the minimum bolt pretension is established based on specifications outlined by organizations such as the American Institute of Steel Construction (AISC) and the American National Standards Institute (ANSI). The specified pretension is critical for ensuring adequate joint performance and preventing issues such as slippage or joint failure under load.

Specifically, for ASTM A325 bolts, the minimum pretension is generally calculated based on the bolt diameter and its grade. In the case of a 1 ⅛ inch bolt, the correct pretension is at least 80 kips. This measurement is designed to ensure that the bolt is adequately tensioned to maintain integrity in bolted connections, especially in structural applications where the safety and performance of the structure depend on secure fastening.

Understanding these specifications helps practitioners ensure that they are using the correct bolt pretension values, which are fundamentally important for the stability and durability of steel structures.