Fillister heads have a slightly rounded top and tall cylindrical sides. The smaller diameter and higher profile give fillister heads a deeper drive slot than round or pan head screws. 12. Hex Heads

Truss heads are typically wider than the heads on other screws and have a slightly rounded surface. You’ll usually need truss heads when working with sheet metal and other projects that require large holes because the wide head prevents the truss screw from going through the hole. 8. Button Heads Predominantly used on screw products where a flat bearing surface is required or on the other hand, where a countersunk is not required. The pan head is produced with a slotted drive or a number of Phillips drives and in Canada with the square drive. According to Mutual Screw, truss screws are also used in the building and repair of electronic items. They are available in machine screws with a truss-style head that is slightly rounded. They’re used to create customized fasteners for a variety of different applications. You may also find them in the automotive industry for fastening the pop-tops on vans and other recreational vehicles. Truss head screws are also used to fix metal lathes as metal studs. There are a variety of screw types as we see here, that are classified as truss screws because the term refers to the shape and size of the head. More facts about truss screws Bugle heads are used mainly on screws made for plasterboard and drywall. This shape is much like a flat screw head, except that, instead of an angle underneath the surface of the head, you’ll see a curved shape that can reduce damage to a surface.The ‘trim’ screw head is a standard countersunk screw that provides a flat, smooth surface after installation. It is an alternative to flat head screws, with a narrower head a more suitable choice for certain applications. The Flat Trim is often used as a finishing screw for carpentry and woodworking. Oval Undercut Similar to a pan head screw, a fillister head screw has a circular top, slightly convex surface and greater height. Its diameter allows for a deeper slot. A fillister head is very similar to a raised cheese head screw, except that it’s taller. These are often used as replacement screws. Oval head screw

Binding screws are a unique type of screw that you can use for a range of projects. These screws have a slightly domed head and screw into each other with a male and female side. Oval head machine screws have a countersunk head with a rounded top surface and a cone-shaped 82 degree bearing surface. The oval style is often preferred over a flat head in conical applications, or when a more decorative look is required. Oval undercut machine screws are similar to the standard oval head style except that the head is undercut 70% of its normal side height. The oval undercut style is standard in shorter lengths because it allows greater length of threads. PanFlat Undercut 82-degree. A flat undercut 82-degree head has the same angle as a standard 82-degree head, but the head is much shorter. This head shape helps give the screw a longer thread on the same screw length because of its shorter head size. Being that they look similar, you might be wondering how truss head and pan head screws differ from each other. The main difference lies in their profile. Truss head screws typically have a lower profile than pan head screws. Flat Head Degrees. Flathead screws have varying degrees. The degree of a flat head refers to its head angle or the angle from the top of the head to the surface where the threaded part meets the head. An 82-degree flat head is the standard angle, but there are also 90-degrees, 100-degrees, and more. A higher degree requires a shorter, but more spread-out, countersink hole. It’s rare to find Pozidriv screwdrivers in the United States, as they are much more commonly used in Europe. 25. Star-shaped heads