OSHA 10-Hour Construction ReviewTools - Hand and PowerMedium
A construction worker is selecting a hand tool for a task that involves applying significant torque to a fastener. To prevent injury and damage, which type of wrench is generally considered the safest and most effective for this application?
- APipe wrench
- BAdjustable wrench
- CBox-end wrench
- DOpen-end wrench
Show answer & explanationAnswer & explanation
Correct answer: C. Box-end wrench
Box-end wrenches fully enclose the fastener, providing maximum contact and grip. This prevents slipping, rounding off the fastener, and potential injury when applying high torque.
Why the other options are wrong
- A. Pipe wrenches are designed for gripping pipes, not for applying torque to fasteners, and can damage them.
- B. Adjustable wrenches are prone to slipping and rounding fasteners under high torque due to their movable jaw.
- D. Open-end wrenches only contact a few points of the fastener, making them prone to slipping and rounding under high torque.
Wrench Selection for Torque
Selecting the correct wrench type is crucial for safety and effectiveness, especially when applying high torque. Box-end wrenches are preferred for their secure grip and ability to prevent slippage.
- Box-end wrenches offer full fastener contact.
- Prevent slipping and rounding of fasteners.
- Safer for high-torque applications.
Memory trick: For tough nuts, box-end's the best, it passes every torque test.