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A hex head cap screw is a six-sided bolt with a trimmed hex head and a washer face on the bearing surface.
It must meet specific tolerances as described under ASME B18. A hex cap screw is a threaded fastener with a hexagonal-shaped head. While the term hex head screw is generally used interchangeably with hex bolt, these two fasteners are actually very different.
The screw head is designed to fit a ratchet or spanner torque wrenches allowing you to tighten the screw to your exact specifications. A cap screw is a screw that has a thick wide head and a flat bottom toward the thread facing site.