What size wrench should be used for tightening a manway with 1 1/4" X 8" stud bolts?

The correct size wrench for tightening a manway with 1 1/4" X 8" stud bolts is 2". The size of the wrench typically corresponds to the nut size being tightened rather than the diameter of the stud bolt itself. In many applications, especially in industrial settings such as those encountered by boilermakers, the nut used with a 1 1/4" stud bolt has a larger size, which necessitates the use of a 2" wrench to fit properly.

A wrench that is too small would not fit over the nut, which could lead to ineffective tightening or damage to the bolt or nut. Thus, it is essential to select a wrench that matches the size of the nut for effective torque application and safety during the tightening process. Understanding the relationship between bolt size and nut size is crucial in this context, as it ensures the integrity and functionality of the connections being made.