How Huck Bolts Differ from Standard Bolts

Bolts are a common form of fastener that may be found in a wide variety of industries and applications, generally being used to secure two or more parts together in an assembly with the assistance of a nut or other similar mating fastener. Depending on the application in question and one’s particular needs, there are a plethora of bolt types that one may take advantage of. For example, huck bolts are a common aerospace manufacturing fastener that some may be unfamiliar with, and they are advantageous for such applications as a result of their unique capabilities and design. In this blog, we will discuss huck bolts in more detail, allowing you to better understand their differences from standard bolts.

In general, the huck bolt design is notable for its inclusion of a pin and collar, the pin being a shank-like structure that has external threading running across the entire length. The collar, meanwhile, will make up the top port of the huck bolt as it encapsulates the upper portion of the pin. Pins and integrated collars will always be in tandem with huck bolts, featuring a threaded and unthreaded portion for use.

While this is not too unique as compared to other fastener subtypes, the design of the huck bolt is set apart from conventional bolts that generally tend to be made from a single part. Additionally, most standard bolts also lack a pin and collar, instead being a simple shaft with external threading that is designed to attach to mating threading and components. These common bolt types will also have a head that allows for easy tightening and loosening with the use of a tool.

As one may imagine, the more unique design of huck bolts also leads to a different method of installation. For a standard bolt, a tool such as a wrench or screwdriver may be used, the difference being whether there is a head with a recess for the bit of a screwdriver or a hexagonal head that is more suited for a wrench. On the other hand, huck bolts require a specialized tool that is known as a huck gun. With a huck gun, the collar of the material will be forcibly wrapped around the bottom of the pin before having the bolt twisted into a hole that is already cut. From here, the huck gun can then be used to secure the huck bolt in place so that it establishes a reliable joint that keeps an assembly together.

As compared to other common aircraft bolts and threaded fastener types, huck bolts are often the choice when loosening is a concern. Huck bolts resist coming apart as a result of vibrational forces, making them very advantageous for aerospace applications in particular. To achieve this, huck bolts feature a protrusion at the bottom side of the pin after installation, creating a swaged collar that prevents the fastener from being easily removed.

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