Screws are the most commonly used fastening technology. In contrast to other connection techniques, such as welding or gluing, screw connections can be detached without damage. Power transmission to the screw takes place through positive connection. P4W produce variety of custom screws, such as set screws, grub screws, machine screws, cap screws, and shoulder screws...

Head types


The slotted profile was the first screw profile ever – and continues to enjoy great popularity. A simple slot serves as a receptacle for the blade of the fastening tool.


Two right-angled slotted profiles form the Phillips profile. Compared to the classic slotted form, the crossed version has better screw properties, since the force application takes place at four edges and thus facilitates screwdriving.

Hex (interior/exterior), hex socket

The hex is one of the best-known and most widely-used profiles. It is hexagonal in shape with six faces, all of which are at a 120-degree angle to each other.




As you know that without fasteners like screws, bolts and nuts, no industry can survive. These are the basic hardware parts required by any machines, whether simple household items to complex high-end machines in industries. It is many times essential to use high quality nuts, bolts and screws. From small furniture crafting to oil sector industries the most essential hardware items include these fasteners – bolted joint is the most trustworthy part connection – moreover, it usually gives an option of dismantling and reinstalling. Anyway, the generalization and systematization process and the most modern technological advancements have changed the field of fasteners for the best.

Screw vs Bolt

Though many times confused by amateurs, bolts and screws are different types of fasteners. Bolts are headed fasteners with external threads suitable for non-tapered nut. They require a nut (or some other thread) as a counter – to lock the joint. The bolts are made with uniform threads satisfying the standard specifications such as UNJ, UNR, MJ etc. and are used in most industrial applications – secured with a spring-washer or a locktite. To sum it up, bolts are designed to use as a fastener placed through already drilled holes in the machine parts and these requires a nut to tighten it from the other end.

Screws are headed externally threaded types of fasteners without meeting the standard specifications of the bolts. They are shafts with provision at one end to turn the screw and have a helical thread on its surface, which is capable of piercing strongly into the surface. They do not require a nut and are used mostly in home-based application – such a connecting a picture to the wall. It is actually the simplest example of converting torque into linear force.