What wrench is best to use when a nut is frozen onto a bolt? (A) a striking-face box-end wrench (B) an open-end wrench (C) a pair of pliers (D) a crescent wrench

To determine the best wrench to use when a nut is frozen onto a bolt, let's analyze the options: (A) **A striking-face box-end wrench**: This type of wrench can deliver a strong impact, which can help break the rust or corrosion that may be causing the nut to be frozen. The enclosed design also provides a good grip on the nut. (B) **An open-end wrench**: While this can be used, it may not provide as much grip or leverage as a box-end wrench, especially if the nut is very tight. (C) **A pair of pliers**: Pliers can grip the nut, but they may slip and are not designed for high torque applications, making them less effective for frozen nuts. (D) **A crescent wrench**: This adjustable wrench can fit various sizes, but it may not provide the same level of grip and torque as a box-end wrench. Given these considerations, the best option for dealing with a frozen nut is: **(A) a striking-face box-end wrench**. This tool allows for both the necessary torque and the ability to apply impact, which is often required to loosen a frozen nut.