Which of the following cutting tools is most commonly used to cut through chains or padlocks?

The most commonly used tool for cutting through chains or padlocks is bolt cutters. This tool features long handles that provide significant leverage, making it easier to cut through thick metal chains and tough padlock hasps. The cutting jaws are designed to provide a shear action that can effectively handle tougher materials typically used in security applications.

In contrast, while a coping saw is designed for intricate cuts in wood or soft materials, it does not have the power needed for heavy-duty metal cutting. A seatbelt cutter is specifically designed for quickly and safely cutting through seatbelts in emergency situations, and it lacks the size and strength to cut through metal effectively. A hacksaw, although it can technically cut metal, is generally not as efficient or practical for quickly severing chains or padlocks as bolt cutters, which are specifically designed for that purpose. Thus, bolt cutters stand out as the optimal choice for these particular cutting tasks.