Screw head shapes1/9/2024 ![]() ![]() The square section under the head grips into the part being fastened preventing the bolt from turning when the nut is tightened. Typically a little more expensive than more common types.Also known as a “coach” bolt, has a domed or countersunk head. The design helps reduce slippage and lessens the chances of the screw head being damaged, meaning they will have a longer shelf life and are not adverse to reuse.Ĭurrently uncommon, so you will need to make sure that you have the right match for head type and screw. While still relatively uncommon they are typically used for installing floorboards, decking, timber cladding and similar. The extra fins are used to reduce slippage and give plenty of torque when screwing in, but also good for taking a screw out. ![]() The Torx head design has six points and is commonly referred to as Star bits. It will round off the recess making the screw useless. Pozi screws look very similar to Phillips screws and a Phillips screwdriver head will fit into a Pozi screw but without the benefits. This can make it ideal for jobs like installing decking. This brings with it the added bonus of higher torque and less chance of the head slipping out of the screw head. The modified screwhead head gives better grip than a Phillips head. You can identify a Pozidriv screw by the four small indentations in between the main cross. The Pozidriv uses a modified version of the crosshead for better engagement with a screw. Created by the same people who brought the Phillips screwdriver to the masses, it is effectively Phillips+. This head type is very similar to the Phillips. Mixing a SAE head with a metric screw might feel like a good fit but isn’t quite right. This can be caused by hex bits being available in SAE (inches) and metric sizes along with screw heads. When high torque is needed the hex type can strip out the screw head making it useless. The six sides make them feel secure and help stop slippage. They are easy to use and are great for medium torque loads such as putting beds and furniture together. They come in a variety of sizes and the bits are typically used with cordless drills, though you can buy handheld screwdrivers to fit the bit. The six sided shape allows for a tight fit and is often found when building furniture. It is all known as Allen as it is often used with an Allen key. Hex is short for hexagon which is the shape of the screw head. Also it doesn’t always get a tight fit as you might with a handheld screwdriver. They can slip out of a screw head easily, especially when used with a cordless screwdriver, which causes damage to the bit. They are versatile and their shape allows you to apply more torque getting a tight fit without messing up the thread. Phillips screws are found on a wide variety of DIY projects from hanging doors, putting up shelves through to building a partition wall. They come in sizes such as PH0, PH1, PH2 - with PH2 being a good all-round choice. They are cross-shaped with recesses all around to create a tight fit on a Philips screw. Phillips screwdrivers are one of the most common types of screwdriver head in use today. This will also break the edges of the slot making it less effective, and in some cases make it impossible to get the screw out. Pressure needs to be applied evenly otherwise the screwdriver can slip out and scratch or mark whatever you are working on. They are not the strongest style of screwdriver head type. vertical or horizontal to create a neat finish to an item. Perfectionists like to line up the slots i.e. Slotted screws are often found in door hinges on internal doors, door handles, more intricate woodworking, plugs and electrical sockets. ![]()
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