Types Of Machine Screws Heads

The screws have cylindrical heads and long vertical sides.

Types of machine screws heads.

A screw is a shaft which has a groove on its surface. It is designed to hold objects in a certain alignment. A screw drive is a system used to turn a screw. Although many people refer to any screw head that has cross shaped grooves as a phillips head there are other types of screws that have similar slots.

There are different types of screw heads which have different applications such as robertson slotted and polydrive. At a minimum it is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. Set screws machine screws with no head for screwing all the way into threaded holes. A sheet metal screw is similar to a wood screw but has a pan head.

An allen screw has a hexagonal indent in the head requiring an allen wrench and the other type has no indent in the hexagonal head and must be applied or removed with a socket wrench. Although this type of screw is one of the most common and inexpensive types it s also the most prone to stripping. The most common types of machine screw head shapes are pan head flat head round head oval head truss head and hex head. Machine screws are also made with socket heads see above in which case they may be referred to as socket head machine screws.

These are generally found on the screws with a hex drive on the top of their head. A brief introduction to the different types of screw heads. A cross head features two full length slots that cross which allows a flat head screwdriver to be used and makes the screw usable even if one slot has been worn away. Slotted head screws are what most people refer to as flathead screws because they have one narrow opening for a flat screwdriver.

In fact slotted screws are supposed to strip by design to prevent you from overtightening them. There are two types of hex screws. While there are a lot of choices available there are only a few different types of screws a woodworker will ever need. A machine screw is generally a smaller fastener less than 1 4 inch 6 35 mm in diameter threaded the entire length of its shank that usually has a recessed drive type slotted phillips etc.

A robertson screw has a square shaped indention and requires a matching driver head. Machine screws come with different types of heads. Machine screws come in coarse thread which means they have 24 threads per inch and in fine thread which means they have 32 threads per inch. Mating screws mating screws have a shoulder that matches the diameter of the sex bolts they are used with.

And there s a basic look at the various types of screws. Know what kind you need for your project before going to the hardware store or home center.