The Hillman Group Hex Bolts: The Hillman Group Screws 3/8 in. -24 x 1 in. External Hex Hex-Head Cap Screw (10-Pack) 4226
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 common feature on a hex cap screw is a washer surface directly under the head which creates a better seal.