From the trusted RS PRO brand, this set of high-quality cross-recess pan and countersunk head self-tapping screws are ideal for many applications. Self-tapping screws are split into two main categories, thread-forming and thread-cutting. The screws are similar in the job they do, however, they have two noticeable differences. One of the screws has a flat base, the other has a sharp point. The difference between self-tapping and self-drilling fasteners is that self-tapping screws will tap a hole into a soft material, self-drilling screws can drill a hole into anything from metal to wood meaning no pilot hole is needed.
The Thread-Forming Screw
Before using this type of self-tapping screw, it is recommended that a pilot hole is drilled into the material. As thread-forming screws have a flat nose, it makes the drilling process easier. Thread-forming screws are used when fastening plastic together.
The Thread-Cutting Screw
This style of self-tapping screw does not require any preparation. As it has a pointed tip, it is not necessary to create a pre-drilled pilot hole. Thread-cutting screws can pierce a small entry hole while being driven into the material the thread is being created.
Self-tapping screws are traditionally used where an application requires regular maintenance and regular easy access. These screws are useful in situations where products must be assembled and disassembled, such as access panels or even furniture.
These thread-cutting self-tapping screws are made from A2 stainless steel (also known as 18.8 grade due to the 18% chromium and 8% nickel content) which provides a high hardness level and resistance to corrosion and wear & tear. The A2 grade Pozidriv screws are supplied in thread sizes 10, 8, and 6 for reliable fixing with suitable sized nuts. The socket screws are used to join materials such as wood, plastic, brick and metal.
