Hex cap screws are bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. These screws are bolts with a washer face under the head. Use these coarse partially threaded screws anywhere a hex bolt may be used. Tighten with a wrench or a drill. * USS partially threaded along shankScrews feature a washer face under the head for a better seal18-8 stainless steel finish for enhanced corrosion resistanceHex cap head and machine threads provide high torque capability50 pieces per retail package