The dome shape creates a visually appealing design on the surface, while the flat inner part of the dome helps the screw stop where it needs to just at the surface. 6. Flange Heads Raised countersunk head screws are called Oval head in the USA and sometimes described as instrument head A Phillips tamper-resistant screw is just like a Phillips drive screw with one big exception. It includes a small pin in the center of the screw drive that prevents you guessed it tampering.

Sometimes features are combined, as in the case of slotted hex, hex washer, slotted hex washer, and round washer head designs. Bugle screws are self-drilling, so you won’t need to drill any pilot holes before using them, and their unique shape allows them to distribute stress over a wider surface than flat screws. 4. Binding Heads Slotted Pan head screws have a gently rounded top surface and curved sides with a flat bearing surface under the head. Pan head screws have generally replaced round, truss and binding heads.A hex head machine screw can be tightened or loosened with a hex wrench. The slotted drive is added to make it easier to remove. One Way Tamper Proof Mushroom head screws are also called roofing bolts. They are very similar to the Truss head but with a cross drive on the head. The configuration has design weaknesses and as such the product is only used where strength is not a requirement. It is similar to ‘flat’ heads, but with no driving recess. The ‘round countersunk’ head is used for shorter screw lengths to provide a longer thread grip and more shallow countersinking. Round Washer Machine screws are threaded fasteners designed to be used with tapped holes and nuts to securely fasten two or more parts together. They are typically made of metal, such as steel or stainless steel, and have a cylindrical shaft with a threaded portion along its entire length. Round head machine screws have a semi-elliptical top surface and a flat bearing surface. They are often preferred over the pan head because of its smooth surface and appearance. Truss

Another benefit of truss head screws is better load distribution. All truss head screws have a wide head. Along with a round shape, this is one of their defining characteristics. When installed, the wide head will distribute the load while subsequently protecting the part or parts from damage. Both truss head and pan head screws will protrude out of the workpieces in which they are installed. This is a defining characteristic of all non-countersunk screws. Truss head and pan head screws are non-countersunk, so they’ll produce out of workpieces. With that said, truss head screws have a lower profile than their pan head counterparts. Some screw drives are better than others at achieving the performance you need for your specific application. Also, remember that different screwdriver heads exist for a reason. For example, a square screw head – or Robertson screw head – needs a Robertson screwdriver, but a slotted screwdriver can handle slotted and one-way screws. For best results, always use the appropriate screwdriver. 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.

Looking for Truss Head Screws?

Like the other tamper-resistant screw drive styles, this means the screw drive design includes a small pin to prevent tampering. Have you heard of truss head screws? They are commonly used in the aerospace manufacturing industry. Like all screws, truss head screws feature external threading, which allows them to secure parts with internal threading. Truss head screws, though, feature a unique type of head that distinguishes them from other types of threaded fasteners. Overview of Truss Head Screws Electronics, automotive, construction, & industrial equipment, such as assembling conveyor systems or attaching parts in machinery They may look similar, but truss head screws and pan head screws aren’t the same. Truss head screws have a wider head than their pan head counterparts. You can find them in different lengths. Nonetheless, most trust head screws have a wider head than pan head screws. Designed specifically for use in drywall (plasterboard) installation because the screw distributes bearing stress over a wider area than flat heads.