While most screwdrivers are manually operated, there are some models that have an internal motor to drive the screws. These products use battery power or a direct connection to a nearby electrical outlet to power the motor. Keep reading to find out more about the different screwdriver types, so you can learn which screwdrivers you should have in your toolbox. 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. 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. The inertia of the screwdriver tip overcomes the friction between the two surfaces, resulting in the screwdriver tip slipping from the screw head. This effect can be lessened, but not eliminated, by carefully matching the correct sized driver to the slot in the screw head. 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. 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. Go slow to ensure that the screwdriver tip grips the screw properly to avoid stripping the screw head. While Torx screwdrivers are not commonly used around the home, it is a good idea to have at least one Torx screwdriver or a set of magnetic Torx bits to use in a multi-bit screwdriver for the odd occasion when you may need to use one. Hex screwdrivers come in a range of sizes and lengths, so it’s important to find a tool that is compatible with the screws to ensure quick and effective installation or removal. The six-sided shape of the hexagon reduces the chance of slipping, allowing hex fasteners to be driven at high speeds by electric-power hex screwdrivers or drills without the screwdriver head stripping the screw notch. Just keep in mind that while the Z-shape provides great leverage for driving or loosening screws and fasteners, an offset screwdriver is prone to slipping and stripping the screws, so it shouldn’t be your go-to screwdriver for everyday use. This type of screwdriver is unnecessary in most circumstances, but if you are working in a tight space or you are driving or removing very long screws, then using a ratcheting screwdriver is recommended to help improve project efficiency. Just keep in mind that the higher the torque, the more likely the screwdriver bit will slip out of the screw notch during use, especially if the bit is a slotted or Phillips head. Also, electric screwdrivers are somewhat limited in their use because these tools need to have a direct connection to a power outlet or the battery needs to be charged in order to function properly. The obvious benefit to this type of screwdriver is that you have a variety of screwdriver bit types to choose from. However, these tools are better for light-duty general use because the loose fit of the bits can contribute to slipping and screw stripping. You should also research the screwdriver grip and shank. If you plan to use the screwdriver for a long period of time, then a padded grip can help reduce hand fatigue. However, you can also find products with hard plastic grips that can improve accuracy and control. The shank extends from the handle to the head of the screwdriver and it comes in a variety of lengths. Look for a screwdriver with the right shank length for the project, keeping in mind that a longer shank can help access fasteners in difficult to reach areas, like inside an engine.
