A socket cap screw is a fastener that is usually used in clamping, machine parts, and die fixturing. A socket cap screw can be particularly useful when you are using an application with limited space for sockets or wrenches. These screws have a cylindrical, barrel-shaped head and a smaller diameter than other machine screws. The benefit is that they don’t require external clearance, so they are useful in tight spaces.
What Is a Socket Cap Screw?
There are a number of different socket cap screws from which to choose for your applications. In general, socket cap screws have a hexagonal socket in the head, and you use an Allen or hex key to tighten or loosen them. They are also called socket head cap screws, hex socket head cap screws, Allen socket bolts, and socket head screws. A socket cap screw is different from a hex head screw because the only part that is hex shaped is the socket, while a hex-shaped screw doesn’t have a socket and is hex shaped on the exterior.
Types of Socket Cap Screws
When you are choosing a socket cap screw, you have several different options. It is easy to find standard socket screws, and they work well in many different applications. Standard socket cap screws have a head that is recessed in a counterbored hole, so it is flush with the surface. This makes a clean finish.
Another type is the button head socket cap screw, which can be called a round screw. It is popular because it looks nice and provides more torque. There are also flat head socket screws, hex socket set screws, hex socket shoulder screws, and more.
Materials for Socket Cap Screws
You will find socket cap screws in different materials, including steel, stainless steel, plastics, brass, and aluminum. The plastics are normally made with nylon or PEEK, and they work well as a replacement for metal. Aluminum is popular because it is a lightweight, corrosion-resistant material that works especially well in automotive applications. Steel is expensive, but it is resilient and durable, and brass is used as a corrosion-resistant option for outdoor applications.