They are most common screw among all. They have cross shape which helps in self centering the screw which avoid the drilling in odd angles. A drill can also be used with this screw and due to their self-centered design, they remain at their place at the time of drill when the force is being applied but head can be strip if too much force is applied.
4. Pozidriv Head Screw: ( Types of Screw Heads )
Pozidriv Head Screw
These screws are somewhat similar to Phillips screws but posidriv screws have more grooves which results the shape of posidriv screws resembling a star. For their removal sometime Phillips screwdriver can also be used. They provide more stability to the applied force as compared to the Phillips screws. The difference between a Phillips screw and a posidriv can be identified by looking them from side. There are ribs between all the four arms of the posidriv and are marked by ‘pz’.
5. Quadrex Head Screw: ( Types of Screw Heads )
Quadrex Head Screw
These head drive are also called as Phillips square drive and they are the combination of square recess and Phillips. Quadrex head drive looks like Philips design but middle of cross shape are squared instead of pointed which prevent stripping when more force is being applied.
6. Slotted Head Screw: ( Types of Screw Heads )
Slotted Head Screw
These are the screws which are generally referred as the flat head screws due to the narrow opening provided for flat screw driver. These screws are most commonly used and are cheap among others. But the main disadvantage of using this screw is that they are very much likely to be stripped. Even the design of this screw is such that they strip for the prevention of over tightening of the screw. They are best suited for the projects which needs a smaller number of screws which can be screw manually instead of using powered drill which can results the screw to strip.
7. Square Recess Screw: ( Types of Screw Heads )
Square Recess Screw
These screws are generally known as Robertson’s. They have square center point which prevent them from stripping out.
8. Star Head Screw: ( Types of Screw Heads )
Star Head Screw
These screws encompass various different styles which form the shape of stars. There is a double square drive which have two robertson’s squares which create 8-point star in middle.
There is a triple square drive which have three robertson’s squares which form 12-point star. Triple squares are generally used for resisting high force and no stripping of the screw commonly used in internal parts of the car such as drivetrain components.
9. Torx Screw Head: ( Types of Screw Heads )
Torx Screw Head
In the middle of these screws they have 6 point star shape and they are generally used for electronics items such as DVD players and computers. These screws are getting popular nowadays due to their ability to resist the slip out tendency which are very important criteria while building electronics.
