Why not just make it one shape, in different sizes?
In: Engineering
Different shapes are good for different applications. For example, flat head or slotted screws are easier to manufacture; many screws in handmade watches tend to be slotted for this reason. Allen head screws can accept a good deal more torque than a slotted screw, and the driver is less likely to climb out of the fastener. The robertson screw head was designed to make it easier to manufacture screws by cold forming, and are easier to screw in one-handed than slotted types. Some types, often called collectively “security” or “anti-tamper” screw, are specifically designed to not be common, so that no one can use common tools to open them.
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