How to Choose Hex Cap Screws

hex cap screws

Are you looking to buy hex cap screws? Like all screws, they feature external threading that accommodates the internal threading of a predrilled pilot hole. Only hex cap screws, however, feature a hexagonal head. You can install them using a wrench. Turning a hex cap screw clockwise will drive it into the hole. Below are several important things to consider when choosing hex cap screws.


While they all feature a hexagonal head, hex cap screws are available in different materials. Steel is a common material from which they are made. With that said, there are different types of steel, each of which has different characteristics. Some hex cap screws are made of A2 steel, whereas others are made of traditional stainless steel or high-carbon steel.


When shopping for hex cap screws, you should check to see what, if any, standards they meet. Hex cap screws are available in different standards. There are organizations that create and manage design specifications for hex cap screws. The International Organization for Standardization (ISO) and SAE International, for instance, have standards for hex cap screws. Each standard has strict design requirements that hex cap screws must adhere to.


There’s no such thing as a one-size-fits-all hex cap screw. Like with other screws, hex cap screws must feature the right size for the hole in which they are used. If a hex cap screw is too big, it won’t fit. If it’s too small, it will remain loose. Therefore, you should consider the size when choosing them.

Pay attention to the diameter and the length when choosing hex cap screws. The diameter represents the distance across the widest portion of the threaded shank, whereas the length represents the distance from the head to the end of the shank.

Thread Type

Something else to consider when choosing hex cap screws is the thread type. Hex cap screws are available in coarse and fine thread. Those with coarse thread have a larger thread pitch, making them ideal for applications in which quick assembly and disassembly are required.

Hex cap screws with fine thread have a smaller thread pitch, which allows for stronger thread engagement. They offer increased resistance to loosening due to vibrations and are commonly used in metal-to-metal applications.

In Conclusion

There are several things you should consider when choosing hex cap screws, some of which include the material, standards, size and thread type.

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