What is the primary function of a torque wrench?

What is the primary function of a torque wrench?

• A. To measure torque with high precision
• B. To apply a precise torque to fasteners to achieve correct preload
• C. To tighten bolts by feel
• D. To remove fasteners

Answer: (B)

Applying a precise torque to fasteners to achieve correct preload is what a torque wrench does. By setting a specific torque, you cause the bolt to stretch to its designed amount, creating the proper clamping force that holds joints together reliably and resists loosening under vibration and temperature changes. This is why tightening by feel can be inconsistent and lead to under- or over-tightening. Some torque wrenches have scales or digital readouts, but the essential goal is to reach the specified torque to ensure the joint is properly loaded. Removing fasteners isn’t the tool’s purpose, and while some models can measure torque, the primary function remains to apply the exact torque needed to achieve correct preload.

Applying a precise torque to fasteners to achieve correct preload is what a torque wrench does. By setting a specific torque, you cause the bolt to stretch to its designed amount, creating the proper clamping force that holds joints together reliably and resists loosening under vibration and temperature changes. This is why tightening by feel can be inconsistent and lead to under- or over-tightening. Some torque wrenches have scales or digital readouts, but the essential goal is to reach the specified torque to ensure the joint is properly loaded. Removing fasteners isn’t the tool’s purpose, and while some models can measure torque, the primary function remains to apply the exact torque needed to achieve correct preload.