What Is a Cap Screw?

A cap screw is a fastener that’s threaded along its entire length, allowing it to be screwed into a tapped hole and tightened by turning the head. It’s often used in applications where the heads of other fasteners could become damaged if they were to protrude too far outward from a surface. It’s commonly used in applications where mechanical properties are more important than dimensional tolerances, such as in the construction industry.

There are several types of head configurations for cap screws, depending on the application they’re being used in. They can have a plain, cylindrical socket-shaped head or they can feature a hexagonal cap with a flat washer (also known as a Philips or slotted screw). The threaded portion of the screw can also be fully or partially threaded. Screws that are fully threaded can be installed without a nut, while those that are only partially threaded must be used with one.

Fully threaded hex cap screws are typically specified in applications that require the strength of a full length bolt. They are available in a variety of grades, which differ in their tensile strength and resistance to corrosion and environmental factors.

Stainless steel hex cap screws are commonly used in environments that require increased corrosion resistance. They are available in many different materials, including 18-8 and 316 stainless steel, which can resist corrosion from chemicals and other elements that can damage other fasteners. Brass hex cap screws are non-magnetic, making them ideal for electrical and communications industries. They’re also corrosion resistant and can be used in some marine applications. Cap screw

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