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types of machine screws

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different types of screws and their uses - understanding

A screw is a type of fastener consists of a threaded shaft and a head on one end, the other end of the shaft can be flat or sharp. The thread on the external surface also called male thread, forms a helical ridge. Screws are used to fasten materials by the engagement of the screw thread with a similar female thread in the matching part, actually, screws are often self-threading, which means that when you turn a screw into the material, the thread will cut into the part and create an internal thread to fasten materials together

Wood screws are a type of screw with a smooth shank and tapered point used for wood or other soft materials. There are many types of wood screws based on different screw heads, including Phillips flat head screw, Frearson flat head screw, slotted flat head screw, slotted oval head screw, Phillips round head screw, and slotted round head screw. The round head wood screws are suitable for attacking thin materials to wood, the flat head wood screws are ideal for securing hinges. Wood screws are often made from stainless steel or brass. 

Machine screws usually are smaller than the average screw and designed with finer, more accurate threads than other fasteners, they are intended to be fastened to an existing tapped hole on the surface of metal parts in various machinery or in conjunction with a corresponding nut. The use of machine screws can be found in machines of all kinds of industries, including manufacturing, engineering, machine tool, and more. They can be used in almost every material such as brass, steel, and nylon. Machine screws also have a wide variety of head types, including Phillips, slotted, star drive, combo, flat, pan, oval, and truss, these head types can form a number of combinations. 

different types of screws and their uses - understanding

A sheet metal screw consists of a fully threaded shank with sharp threads and a tip, and a head. Full threads can increase retention between materials and the sharpness allows it to cut into the material and form its own internal thread easily. Sheet metal screws are often used to fasten metal parts to metal parts, or attach metal pieces to plastic, wood, rubber, or other materials. Sheet metal screws can be classified into self-tapping screws and self-drilling screws. Self-tapping sheet metal screws have a sharp tip to fasten metals with pre-drilled holes, while self-drilling screws can cut through metals that have not been drilled with their drill point tip. 

Socket screws are also known as Allen head screws, designed with a hexagonal internal drive built into the head and required to be tightened or loosened with an Allen wrench or hex key. This feature sets socket screws apart from other types. Other than that, socket screws are often squared off at the tip, this type called flat point socket screws and widely used in common applications. Socket screws combine lots of advantages and features of other hex fasteners, it’s convenient and easy to use. They offer higher torque and clamping force than regular screws, so in a given application, fewer socket screws can achieve the desired clamping force and complete the fastening, which allows fewer holes, lower overall weight, and reduced hardware. So socket screws are a preferable choice for applications where require lightweight. Socket screws can be made from aluminum, steel, brass, and more. 

34 different types of screws and their uses - the ultimate

Also referred to as bolts, screws are generally defined as fasteners that are installed into materials using tools like hammers or screwdrivers. Screws come in all sizes and shapes, and each one with different features. They can be round, fat, thin, short, long, and more, but how do you know which is the right screw for your project?

Decking screws are made of stainless steel or carbon steel and specially designed to attach wooden or composite boards to metal or wood. These screws come in various widths and lengths and are the perfect solution for fastening decking boards to frames

Pan-head screws have flat heads with rounded sides and commonly used for metal applications. These machine screws are similar to rounded oval head screws, with the difference being that the oval head types are also rounded on top, whereas the pan-head screws are flat heads. Pan-head screws are also available in slotted heads with a single cut that makes them compatible with the screw drive of any screwdriver. 

Hex cap screws are large-sized bolts with a hexagonal head – hence their name! They are used to attach wood or metal to wood. Hex screws consist of tiny steel threads that make them ideal for interior home improvement projects or stainless steel exterior tasks. These screws also feature a flat washer under the screw head and provide precise applications

34 different types of screws and their uses - the ultimate

Carriage bolts are specifically used in woodworking projects to fasten metal to wood. These bolts have a domed head that prevents loosening. The large head shape of carriage bolts also prevents them from getting pulled through a wooden construction

Aside from being intended for use in woodworking projects, carriage bolts are just as suitable for metal applications thanks to their machine screw thread. Having said that, carriage bolts are not compatible with drill adaptors so installing them in metal can be rather difficult if not impossible. 

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