The Hillman Group 220388 Grade 8 Hex Cap Screw, 3/4-Inch X 3-1/2-Inch, 20-Pack Product Description Hex cap screws can be used when looking for outdoor applications or a stronger bolt. The name hex cap screw and hex bolt are commonly interchanged. A hex cap screw is actually manufactured with tighter tolerances and can be used anywhere a hex bolt is used. From the Manufacturer Hex cap screws can be used when looking for outdoor applications or a stronger bolt. The name hex cap screw and hex bolt are commonly interchanged. A hex cap screw is actually manufactured with tighter tolerances and can be used anywhere a hex bolt is used. Features A Common Feature On A Hex Cap Screw Is A Washer Surface Directly Under The Head Which Creates A Better Seal An Alternative For Using Them Without Nuts Is To Install Them Directly Into A Compatible Internally Threaded Hole Grade 8 Screw From The Brand Name: The Hillman Group USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.