According to the Specification for Structural Joints using high strength bolts, how much larger must the nominal diameter of standard bolt holes be compared to the nominal bolt diameter?

The correct answer is that the nominal diameter of standard bolt holes must be 1/16 inch larger than the nominal bolt diameter. This requirement is specified to ensure that there is sufficient clearance for the bolt to be inserted without excessive difficulty while also allowing for proper alignment and adjustment during the installation process.

Having a hole that is slightly larger than the bolt diameter accounts for manufacturing tolerances, potential misalignment, and the need for the installation crew to work effectively. A 1/16-inch clearance also helps prevent issues such as galling or binding of the bolt during tightening or movement under load.

This standard is supported by various guidelines and codes in structural engineering that emphasize ensuring that fasteners can be properly installed and that they will perform effectively in their intended applications. By following this specification, the structural integrity and safety of the assembly are maintained, as it accommodates necessary adjustments while promoting the proper function of the bolted connection.