There are hundreds of different types of screws. While most of them feature a pointed tip, some screws feature a cupped tip. Known as cup point set screws, they are designed to be driven completely into the object in which they are installed, resulting in a flush finish. To learn more about cup point set screws and how they work, keep reading.
What Are Cup Point Set Screws?
Cup point set screws are threaded fasteners that are designed to secure two or more parts together without a nut. As their name suggests, they feature a cupped tip. Rather than being conical and pointed, the tip is indented. This allows them to dig into materials during installation while subsequently creating a strong grip.
Common uses for cup point set screws include the following:
- Gears
- Pulleys
- Shafts
- Collars and couplings
- Machinery parts
- Clamps
How Cup Point Set Screws Work
Unlike traditional screws, cup point set screws don’t have a protruding head. They still have a head, but it consists of a recess — typically a hexagonal recess — that’s flush with the screw’s body or shank. You can install a cup point set screw using a driver of the same type. If it features a hexagonal recess, an Allen wrench will work.
Allen wrenches are L-shaped tools with a hexagonal cross-section. They are designed for use with fasteners that have hexagonal sockets. To install a cup point set screw, place an Allen wrench in the head and turn it clockwise. As you turn the Allen wrench, you’ll drive the cup point set screw into the underlying material.
Why Use Cup Point Set Screws
Cup point set screws offer several advantages over traditional screws. With their concave-shaped point, they are able to create a strong grip. The cupped point will dig into materials during installation, which holds the screw in place.
Cup point set screws also offer a clean finish. You won’t see the head sticking out the objects with which they are used after installing them. Since the head sits flush with the screw’s shank, cup point set screws are often used in applications where a smooth surface is desired.
Another advantage of cup point set screws is that they work with a variety of materials. You can use them with soft materials, such as wood and plastic, and you can use them with hard materials like steel and other metals or alloys.
In Conclusion
Not all screws feature a pointed tip and a traditional Phillips-recess head. Cupped point set screws have a cupped point.