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Head: Hex bolts have a hexagonal head for wrench use, while machine screws typically have a smaller head, like a pan or flat head, and are driven by a screwdriver.
Usage: Hex bolts are often used with nuts to fasten parts together and are ideal for heavy-duty applications. Machine screws are usually threaded directly into a tapped hole or used with a nut in lighter-duty applications.
Strength: Hex bolts generally offer higher tensile strength compared to machine screws due to their larger diameter and thicker threads.
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