Oval head – Oval heads are designed similarly to flat heads, except they have a rounded finish at the top.They’re used in applications like furniture and machinery assembly, where sleek design is important. Flat head – As their name suggests, flat heads are countersunk and allow for a flat and smooth surface post-installation.They’re used for applications where aesthetics and smooth appearances are necessary. Round head – Round heads offer a more finished appearance than some other rounded screw alternatives.They’re used in many applications involving construction and machinery assembly. Hex head – Also common in bolts, hex heads provide superior torque due their external drive design.This can help get a feel for which applications require which types of heads, and why. Now, let’s take a look at some of the more common screw head types and their uses. RELATED: Need a specialty bolt, screw, or stud? Wilson-Garner can help. The variation in heads allows you to choose the one that will make your application stronger and more dependable. ![]() Every screw head type was created to transfer torque (energy) more effectively from a particular drive mechanism, or tool - helping its threaded body twist into a hole easier and with more tightness. Instead, there are many different screw heads because each screw head style allows for different torque. ![]() Why Are There So Many Unique Screw Head Types?Īll of this begs the question: why are there so many different screw head types? And the answer isn’t just to drive you crazy or make you have a thousand different tools on hand at all times. External drive screw heads require a tool, like a wrench, to wrap around the head for installation and removal.Internal drive screw heads require a tool, like a screwdriver, to be inserted within the head for installation and removal.Basically, this means that screws can be categorized by whether a tool needs to be inserted in or wrapped outside of the screw head for installation or removal. The drive style, or drive recess, refers to what kind of tool you use to install or remove the screw. This category encompasses the largest number of screw head types. Instead of tapering toward the shank, non-countersunk screws have a narrow shank that’s topped with an abrupt wide head. Non-countersunk screw heads protrude from the material surface after installation, leaving the head fully exposed.Their design tapers toward the shank, allowing the head to essentially “sink” into the surface. Countersunk screw heads rest evenly with the material surface after installation.All screw heads can be categorized into one of these two categories. Non-CountersunkĬountersunk and non-countersunk design refers to how much of the screw head is exposed after being applied. While there are a few different methods of screw head categorization, the most common are countersunk vs. ![]() So how do you account for each of these head types, and how do you determine which is right for your application? There are a few ways, but the best is to narrow it down by categorizing them. And when you consider all the modifications made for specific applications, that number continues to rise. The exact number is difficult to count, but it’s probably nearing the hundreds. How Many Screw Head Types Are There?Īs mentioned above, there are a lot of screw head types. Let’s explore how many unique screw head types there are, why there are so many of them, and what a few of them are specifically used for. However, just like there are hundreds of fastener types available for use, there’s also a multitude of unique screw head types, each offering their own purpose and benefits. When most people think of a screw, the most common Phillips head is likely to come to mind.
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