More Info on Screws
A screw is a fastener with a circular ridge known as threads which are wrapped around a cylinder. The main function of a screw is to fix together two objects. While some screw threads are designed to get along with an internal thread, there are some threads that are made to cut a helical groove in a softer material, like wood or plywood, when the fastener is inserted.
Screws are versatile and amazingly powerful to hold two different surfaces in place. All of them come with threaded cylindrical parts, which are designed for inserting into any kind of material, wood, metal or plywood. There are also various other factors that decide the type of screws available in the market.
Slotted - The heads of these screws or fasteners are most probably the oldest and common kind. The linear slot in the screw’s head is compatible with standard screw drivers, such as the flat-head screwdriver.
Philips - These screws are the enhanced forms of slotted varieties. Their cross-shaped laps, which are not continuous up to the edge, require a Phillips-head screwdriver. The heads of such rivets enables a larger mating surface, reducing the chances of wear and tear and also prevent slipping. A cross head features 2 full-length slots, which can only work with a flat-head screwdriver.
Square - This type is also known as Robertson screw head and features a square dent to avoid chances of slipping. Can be worked with a special kind of driver.
Hex - These come with a hexagonal recession in the head or without grooves. The hex socket screw or allen screw requires an Allen wrench, featuring a hexagonal shaft and the other type of hex screw’s head is completely hexagonal in shape. You can tighten or loosen it with a socket wrench.