| Cap Screw |
|
It has a convex head, usually hexagonal, designed to be driven by a spanner or wrench, but also made as flat head and is used where strong holding power is essential
|
| Wood Screw |
|
It has a tapered shaft allowing it to penetrate undrilled wood.
|
| Machine Screw |
|
It has a cylindrical shaft and fits into a nut, a tapped hole or a small bolt.
|
| Self-tapping screw or thread cutting screw |
|
It has a sharp thread and that cuts its own hole, often used in sheet metal or plastic. They usually have a notch at the tip, through several threads, that aids in chip removal during thread cutting.
|
| Thread rolling screw |
|
It has a lobed crossection (instead of round). They form the threads (rather than cutting) during installation. They are usually used in steel holes.
|
| Drywall screw |
|
It is a specialized self-tapping screw with a cylindrical shaft that has proved to have uses far beyond its original application.
|
| Set screw |
|
It used to prevent loosening due to vibration, available with thumb screw, square head, Allen head (inset socket) and, most commonly, headless, designed to be inserted flush with or below the surface of the workpiece.
|
| Dowel screw |
|
It is a wood-screw with two pointed ends and no head, used for making hidden joints between two pieces of wood.
|