What are threads on a screw?

• A. The pointed tip of the screw
• B. The long part of the shank
• C. The grooved part of the shank
• D. The head of the screw

Answer: (C)

Threads on a screw refer to the helical ridges or grooves that spiral around the shank. These threads are critical because they enable the screw to grip into materials, such as wood, metal, or plastic, providing the necessary holding power when the screw is driven into a surface. The design and depth of the threads can vary depending on the type of screw and its intended application, influencing factors such as torque, pull-out strength, and the ease with which the screw can be installed and removed.

The other choices mention aspects of the screw that do not directly define what threads are. The pointed tip helps with penetration, the long part of the shank provides the overall length and support, and the head is crucial for driving the screw in and removing it, but none of these represent the threaded section itself, which is fundamental to how screws function.