10 Types of Screws for Metal and Plastic Use

Machine screws feature a uniform diameter along their entire shaft length and typically require a nut or a tapped hole for installation. They come in various head types, including flat, oval, round, and pan, making them versatile for a wide range of applications in both metal and plastic assemblies.

Designed with a cutting edge, self-tapping screws are capable of creating their own threads when driven into a pre-drilled hole. This characteristic makes them ideal for fastening metal and plastic materials without the need for tapping or threading beforehand.

Sheet metal screws are specifically designed with sharp threads to cut into thin materials such as metal and plastic sheets. They often feature a flat or pan head and are widely used in applications requiring secure fastening of lightweight materials.

While primarily intended for wood, wood screws with sharp points can also be effectively used for fastening plastic materials. They feature coarse threads and come in various head types, offering versatility in applications where both wood and plastic are involved.

Thread-forming screws excel in applications involving softer metals like aluminum or plastic. Rather than cutting threads, these screws form them by displacing material as they are driven in, providing strong and reliable fastening solutions.

Featuring a hexagonal head, hex head cap screws are tightened using a wrench or socket. They offer high tensile strength and are commonly employed in machinery and automotive applications, providing secure fastening for both metal and plastic components.

Similar to hex head cap screws, socket head cap screws boast a cylindrical head with an internal socket drive, enabling flush installation. They find widespread use in machinery and electronics, offering a neat and streamlined fastening solution for metal and plastic parts.

Thumb screws are designed for tool-free tightening, featuring a knurled or large head that can be easily manipulated by hand. They are ideal for applications requiring frequent adjustments or removals, providing convenient and reliable fastening in both metal and plastic assemblies.

With a rounded top surface, round head screws offer a smooth finish and appearance when installed. They are suitable for various metal and plastic applications where aesthetics and functionality are equally important.

Flat head screws feature a countersunk head design, allowing them to sit flush with the material's surface once driven in. This characteristic makes them suitable for applications where a seamless and smooth finish is desired in both metal and plastic assemblies.