For a heavy pull on a nut, which tool is recommended?

Using a box wrench or socket wrench is the recommended approach for applying a heavy pull on a nut due to several reasons. Firstly, a box wrench or socket wrench provides full contact with the nut, which enhances the gripping surface. This full engagement reduces the risk of slipping off the nut, which is particularly important when significant force is applied.

Additionally, box and socket wrenches are typically designed to handle higher torque loads effectively. Their design allows for a more even distribution of force around the nut compared to an open-ended wrench, which can cause rounding off of the nut edges if excessive force is applied.

The option of using tools with the opening facing you or away from you may limit the effectiveness of your grip and control when dealing with heavy torque. Open-ended wrenches, while useful in certain situations, lack the deeper engagement provided by box and socket wrenches. Furthermore, adding a "cheater bar" can sometimes lead to improper torque application or increased risk of damaging the nut or tool, making this option less favorable in a controlled work environment focused on safety and effectiveness. Thus, choosing a box wrench or socket wrench is the safest and most effective choice for handling heavy pulls on nuts.