What are Blind Bolt Fasteners

Bolts are important fastener types for a number of commercial and industrial assemblies, allowing for robust connections that can handle shear and tension forces. For installation, a standard bolt is passed through holes of components, and it is then paired with a nut to provide a permanent fastening solution through compressive force. While bolts may provide strong assemblies for a number of applications, certain areas may prove difficult for making connections such as when one side of the assembly cannot be accessed. With a blind bolt fastener, affixing components in hard to reach areas becomes much easier, all while ensuring a strong, lasting joint.

While there are a variety of blind bolt types that may be chosen depending on the needs of the assembly, most have a similar design and use the same installation methods. In general, blind bolts feature a steel pin, collar, and sleeve that may be installed into a preformed hole with a special blind bolt tool. Similar to a blind rivet, the blind bolt tool causes pressure on the collar, and the blind side expands to form a second head on the opposite surface of the assembly. The tool also causes the collar to become a seal on the installation side, and this allows for an installation that is easy to conduct which remains more powerful than a standard bearing rivet. Due to its installation method through expansion, nuts are not needed for tightening, meaning that less parts are required for the fastener to function correctly as compared to a conventional bolt. Additionally, blind bolts are easy to inspect, making maintenance and replacement a much simpler process.
As stated before, the blind bolt fastener is most optimal when the area of installation proves too tight of a fit for standard bolts and nuts. With their strength and resistance to forces such as vibration, the blind bolt proves to be an extremely useful fastener type for applications such as aircraft, marine vessels, automobiles, construction, mining, and much more. With their capabilities and long service lives, blind bolts provide installations with steadfast bonds that can be relied upon even in the face of extreme conditions.
 As the strength and abilities of blind bolt fasteners are determined by their length, the correct bolt should be chosen based on the desired installation. In general, the grip length of the blind bolt should match the area between the first shaft thread and the underhead-bearing surface. With grip gauges, the needed bolt size can be measured through insertion into the assembly hole. Tensile strength is also critical for many applications, thus finding the correct thickness, materials, and rating is important. Lastly, corrosion can cause a fastener to quickly fail if the material is not suited for a particular application, so bolts that are placed in substances or extreme environments should be of a resistant material that caters to the specific application in question.
Altogether, blind bolt fasteners can prove extremely useful for a wide variety of industries and assemblies, providing an ease of installation for combatting shear and tension forces. At Simplified Purchasing, we can help you source the blind bolt fasteners that you have been in search of with ease. With a multitude of new, used, and obsolete components listed across our robust part catalogues, we provide customers with rapid lead-times and competitive pricing on everything we carry to ensure that their operations continue smoothly and efficiently. Get started on the purchasing process today and see how we can serve as your strategic sourcing partner.


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