Different types of strapping joints are available to help you secure a load with steel strapping. Once your steel strapping is applied, you need to close it by creating a secure joint where the two ends meet. The integrity of your strapping joint determines the integrity of your entire unitized load, so it’s important to choose the right type of joint for your specific application. Let’s look at the different types of strapping joints available, so you can become more familiar with each one.

Notch Joints for Strapping

Notch joints are commonly used to seal waxed strapping in packaging and unitizing applications. This type of strapping joint involves cutting or “notching” the seal to create little tabs on the ends. A sealing tool will cut the notches to create the joint for you. The tabs can be bent down to create a typical notch joint, or they can be bent upwards to create what is called a reverse notch joint. You can create a single, double, or triple notch joint. Notch joints mechanically lock the strapping ends together for a sturdy seal and a stable load.

Crimp Joints for Strapping

Crimp joints are another way to seal the ends of strapping, especially for applications where the load is subject to severe impact, such as car loading. When creating a crimp joint, the seal is pressed or “crimped” to create undulations in the seal and the strapping ends. This allows high frictional forces to hold the strapping ends together, thanks to the deformed seal. You can create multiple crimps in the seal to increase the hold of the seal. A crimp joint offers a dynamic and high static joint strength that can withstand heavy impacts while maintaining the integrity of your unitized load.

Sealless Joints for Strapping

A sealless joint eliminates the need for strapping seals and can help you cut back on material costs for big savings. When closing strapping with a sealless joint, you’ll need a manual or pneumatic combination tool to complete the job. By utilizing a set of interlocking keys, a sealless joint provides static joint strength equal to that of a notch joint. Some sealless joints may be reversed at one interlocking point to add greater security to the load for impact conditions. Typically, you’ll see a three key sealless joint or a four key, reversed lock sealless joint. This type of joint for strapping is applied quicker than other alternatives, which makes it useful in high volume applications.

Now that you know the three types of strapping joints for steel, you can select the right one for your specific application. The correct seal joint will allow you to store or transport unitized loads with confidence. If you aren’t sure which type of seal joint will work for your company, you can speak with a packaging professional to get a custom solution. You can also conduct testing with each type of seal joint to see which performs at the level you need. This gives you a specific answer that’s perfectly tailored to your application.