Often people assume they are the same, but a hex head cap screw and hex head bolt are actually very different fasteners in terms of how they are manufactured, as well as from an application perspective. Regardless of your choice, hex heads offer strong, stable joints because of their large head service.
Hex Head Cap Screw Sizes
• #00 - 4"
• M1.2 - M100
Hex head cap screws are available in both fine and course threads, partially and fully threaded and in a variety of materials.
Hex Head Cap Screw Advantages
The most important feature of a hex head cap screws is that it has a larger bearing surface area which provide better clamping pressure than other type of fastener such as a socket head cap screw. Additionally, since debris build up is less of an issue with this style of fastener verses a socket head cap screw, they are ideal of dirty applications where particles could clog up a socket. Though socket heads are typically used for tight access applications, hex heads can be a better choice when there is only side clearance available for tightening.
The Hex Differences
Hex Head Cap Screw
• Precise applications where tight tolerances on the body dimensions are required.
• Features flat washer facing under the bolt head.
• Also called a finished hex bolt.
Hex Head Bolt
• Appropriate for when mechanical properties are more important than dimensional tolerances.
• Hex bolts have a flat end and lack the washer face under the head.