There are many different types of screw heads, but here are six of the most common ones:
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Flat head: A flat head screw has a flat top and a conical shape on the underside, which allows it to be driven flush with the surface of the material it is being used on.
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Round head: A round head screw has a rounded top and a cylindrical shaft, which allows it to be used in a variety of applications.
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Phillips head: A Phillips head screw has a cross-shaped indentation on the top, which allows it to be driven using a Phillips head screwdriver.
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Torx head: A Torx head screw has a six-pointed star-shaped indentation on the top, which allows it to be driven using a Torx driver.
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Hex head: A hex head screw has a hexagonal indentation on the top, which allows it to be driven using a hex key or hex driver.
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Square head: A square head screw has a square indentation on the top, which allows it to be driven using a square drive screwdriver.