Which tool would you use to turn a hex nut on a machine?

• A. Combination Wrench
• B. Phillips Screwdriver
• C. Router
• D. Sledge Hammer

Answer: (A)

When turning a hex nut, the tool must engage the six flat sides of the nut to apply torque cleanly without slipping. A combination wrench fits hex nuts well because it provides two types of grip in one tool: the box-end grips the flats securely for maximum torque and reduced risk of rounding, while the open-end offers quick access for sliding the tool on and off in tight spaces. This makes it the most effective and reliable choice for tightening or loosening a hex nut on a machine.

The other tools aren’t suitable for this task. A Phillips screwdriver is designed for screws with a cross-shaped recess and cannot engage a hex nut. A router is a woodworking tool used for shaping material, not fasteners. A sledge hammer is an impact tool and would not provide the precise torque control needed to safely tighten a nut.