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Product Description Hex Cap Screws are bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. As the most common type of bolt, hex cap screws are standard hex bolts with a washer face under the head. Usually hex cap screws are only partially threaded. From the Manufacturer Hex Cap Screws are bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. As the most common type of bolt, hex cap screws are standard hex bolts with a washer face under the head. Usually hex cap screws are only partially threaded.