Which wrench is best for loosening a bolt?

The best choice for loosening a bolt is the box end wrench. A box end wrench features a closed loop that fits over the head of the bolt, providing a secure grip and allowing for better torque application compared to other types of wrenches. This design helps to prevent slipping, which can be a common issue with open-end wrenches, particularly if the bolt is heavily rusted or overtightened. The box end wrench is also capable of fitting snugly around the bolt, making it effective for loosening it without stripping the head.

While adjustable and socket wrenches are also capable of loosening bolts, the box end wrench generally provides superior advantages in situations where a firm grip and torque are needed. The adjustable wrench offers flexibility in size, but it may not grip as tightly as a box end wrench, especially on smaller bolts. The socket wrench is excellent for reaching into tight spaces or dealing with bolts in awkward angles, but for straightforward loosening tasks, the box end wrench is typically the preferred option due to its efficiency and effectiveness.