Review the wiki prior to posting.Īvoid questions that can easily be answered by searching on the internet.Īvoid questions that have already be answered by a post in the FAQ section of the wiki. Most general career related questions should be placed in the Monday Career Megathread. Post titles must be a question about engineering and provide context - be specific. You can insert a clutch head security screw with a regular flat-head screwdriver but you cannot use it to remove the screw unless you have a clutch head security screwdriver to release the fastener.Call for Engineers: Tell us about your job! (2020) New to AskEngineers? Read our subreddit rules and FAQ page before posting! Topic Filters Removing this type of screw is very difficult, which is why it's used to discourage theft. The screw head is designed with sloping inserts that help the fastener go into a surface one way permanently. However, a newer style clutch screw, also called a clutch head security screw or irreversible screw, is meant for anti-theft purposes. You can't mistake this type of clutch drive because the screw head hole is shaped like a bowtie, butterfly, or dog bone. For example, the clutch screw has evolved from a drive that was commonly used in the manufacture of mobile homes, recreational vehicles, and classic automobiles and trucks produced in the 1950s. Best for: Use for either older clutch screws or newer clutch anti-theft screwsĪ clutch screwdriver will depend on what type of clutch screw you have.Note that a Frearson screwdriver, commonly used in the marine industry, is similar to a Phillips head screwdriver but its tip may be sharper and has a 45-degree angle for better torque. Go slow to ensure that the screwdriver tip grips the screw properly to avoid stripping the screw head. While Phillips screwdrivers do provide better control and driving power, the tip can still slip out of the screw head if it is driven with too much force. Similar to flathead screwdrivers, there are a wide range of sizes and lengths for Phillips screwdrivers and they also come in both manually driven and electric options. These tools were developed in the 19th century as an improvement over flathead screwdrivers because the shape of the screwdriver head provides better traction or grip when you are driving or removing screws. Phillips screwdrivers have an X-shaped tip that is made to fit inside the X-shaped notch of a compatible Phillips head screw. Best for: Driving or removing screws with an X-shaped notch. This effect can be lessened, but not eliminated, by carefully matching the correct sized driver to the slot in the screw head. The inertia of the screwdriver tip overcomes the friction between the two surfaces, resulting in the screwdriver tip slipping from the screw head. This can happen if the screwdriver is misaligned in the screw head slot, but can also be caused when the amount of torque applied to the screw head exceeds a specific limit. You can find manually driven and electric flathead screwdrivers, though these products are limited by the cam-out effect, which occurs when the screwdriver tip slips off the screw head. These tools can come in various sizes and lengths, including oversized flathead screwdrivers that are useful in automotive work, standard-size screwdrivers for furniture construction, and precision flathead screwdrivers that are suitable for working on computers and other delicate electronics.
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