Blind bolt fasteners are among the strongest and most versatile fasteners in use today. For construction, manufacturing, transportation, and other industries, blind bolts have proven themselves to be permanent and secure, and they are ideal for applications where a weld, rivet, or some other kind of joint just won’t do.
In fact, blind bolt fasteners have become so popular that they now come in a variety of sizes, strengths, and configurations for every conceivable application. That’s why it’s important to know about the types of blind bolts currently available, the vendors who make them, and their potential applications.
A blind bolt fastener is a structural fastener that offers greater strength and adaptability than a weld or rivet. The term “blind” bolt comes from the fact that you can only see one side of the workpiece when you apply these fasteners. Using predrilled holes, you can fasten two pieces together without having to access the other side.
Most blind bolt fasteners consist of a steel pin, a sleeve, and a collar. The blind bolt is inserted into a predrilled hole and driven home using a blind bolt tool, similar to a riveter. The collar forms a strong bond as the expander collapses to hold the blind side firm, and the collar creates a seal. Blind bolts are solid, fast, and easy to install without any training. They are ideal for applications such as connecting box sections, girder cavities, or any application that needs a firm connection with superior strength.
Versatile and Tamper-Proof
What makes blind bolts so versatile is that they are so easy to install and stronger than rivets. They also are easy to inspect to ensure the bolt is properly installed. The strength of the blind bolt fastener is determined by its length from the underhead surface to the first thread of the shaft. The grip is the thickness of the material being joined. When properly installed, blind bolts are quite tamper-proof, making them ideal for public buildings and transit systems. They also can be cleanly removed using the right tool without damaging the hole or the material.
Because of their durability and resistance to vibration, blind bolts are finding their way into a wide range of applications, including automotive manufacturing, construction, shipping, public transit, rail, and mining—any environment where the material bindings need to stand up to heavy use. They are also ideal for public buildings and other applications where vandalism may be a problem.
Two Winning Blind Bolt Makers
There are thousands of blind bolts on the market, so you need to choose the right blind bolt fastener for the job. Here are two of our most popular blind bolt fasteners from two leading manufacturers:
Avdel’s Avbolt® Blind Bolts: For heavy-duty applications such as construction, transportation, mining, or bridge-building, the Avdvel Avbolt has been designed with a stem made from steel and black oxide and a carbon-steel, zinc-plated collar. The Avbolt is available in diameters from 3/16 inches to 5/8 inches and outperforms rivets and welds. Avbolts also have a locking feature that ensures a permanent and tamper-proof joint that resists vibration.
Huck BOM® Blind Bolts: Huck is one of the most trusted names in blind bolts, and the Huck BOM (blind, oversized, mechanically locked) is one of the strongest fasteners available. Its push-and-pull installation design makes it perfect for applications that normally require welded or threaded fasteners, such as military vehicles, rail cars, and auto suspensions. The Huck BOM requires no special skill to install and has a high joint tightness, making it tamper-resistant and hard to remove. It also has a mechanical lock feature to create vibration-resistant joints. In fact, the BOM is so tough that one Huck BOM bolt can do the work of four conventional fasteners.
To determine the right blind bolt fastener for the job, you need to match the hole size to the length you need to cover to join the materials together. The easiest way to match the bolt to the job is by using the manufacturer’s range chart and manufacturer’s performance chart.
If you are unsure which blind bolt is best suited for your particular application, consider contacting an experienced distributor. A top-notch partner can identify which type and size of bolt you’ll need while offering advice and resources to ensure you can complete your job with high quality.