What is the snug-tightened condition in bolting?

The snug-tightened condition in bolting refers to a state where the bolts are tightened to a point that they are securely in contact with the connected material surfaces, but not to a level that generates significant tension in the bolts. This condition is essential because it lays the groundwork for achieving proper preload in bolted connections during subsequent tightening or load applications.

The option indicating that snug-tightening is reached through a few impacts of an impact wrench aligns with this understanding. An impact wrench produces a series of short bursts of high torque, which allows the bolt to be secured tightly enough to eliminate gaps between the joint surfaces without overstressing the bolt. This method is efficient in achieving the snug-tightened condition, as it allows for the applicability of torque that stabilizes the connection while preventing excessive tension in the bolt.

In contrast, other methods mentioned, such as hydraulic wrenches, power screwdrivers, or manual turns, do not accurately represent the snug-tightened condition. Hydraulic wrenches often set bolts to a much higher tension than what is defined as snug-tight. Power screwdrivers may not provide the necessary torque control for proper snug-tightening. Manual turns could vary widely in the amount of torque applied, making it less reliable for achieving the snug-tightened state