A guide to Tension Control Bolts (TCBs)


Controlling Tension Bolts, sometimes known as TCBs, are used to join steel to steel in high-strength applications. It’s one of the most popular fasteners for high-strength applications, even outnumbering big hex bolts. The dome-shaped head is not meant to be driven using standard tools. Working with it necessitates the use of a unique wrench. The bolt is bent after installation, and the extension of the bolt is sheared off due to the torque. Its spline also helps us to determine when the bolts have attained the exact amount of tension.

Properties of Tension Control Bolts

Any slippage is prevented by the fact that these bolts have a strong grip connection. Preloaded bolts, such as TC bolts, are recommended in designs where fatigue is a major factor. The tension is evenly distributed across the structure because of the substantial preload. TC bolts are highly adept at handling vibrations and ensuring that the structure is not loosened if put appropriately. This is due to the preload that these bolts have when they arrive.

Preloaded TC bolts prevent the impact of load reversals in constructions that include swaying movement of heavyweights, such as cranes. It guarantees that the structure will not weaken or dissolve. TC bolts not only prevent load reversals, but also remove any potential connection slippage, even over moment-resisting components.

Benefits of using Tension Control Bolts

These structural bolts are utilised in the construction of steel constructions, as we explained earlier. As a result, they are designed to ensure that the construction lasts as long as feasible. Furthermore, despite the sophisticated fastening mechanism, they are simple to use and only take one person to install. It has built-in functionality for determining the tensioning needed to hold the structure together, as well as assisting the user in doing so. This feature allows the user to check whether the desired tension is attained independent of the amount of torque used to secure it.

  • Bolts with smaller diameters can be used with higher quality steel and larger preloads
  • There will be no bolt relaxation because torsional shear is not created during tensioning.
  • Because TC bolts are vibration resistant, they do not require lock nuts.
  • The bolts are simple to install and only require one person.
  • TC bolts of various sizes can be installed with a single tool.
  • There is only a small amount of tool maintenance necessary.
  • Operator weariness is reduced.
  • Hand Arm Vibration Syndrome is not a concern.
  • Heavy calibrated torque wrenches are not required.

Problems with Tension Control Bolts

Despite the fact that these screws can be installed by a single person in a short period of time, they are considered a difficult task. As a result, some building owners choose steel fastening to normal hex bolts for steel fixing. However, it’s crucial to keep in mind that, when properly installed, they provide significantly more advantages than normal structural hex bolts.

One essential aspect of tension control bolts that users should be aware of is that once they are withdrawn from the packing, they will corrode and lose their lubrication. This means that they must be fastened as soon as they are opened. Another reason to tighten the tension control bolts right once is that the shear stresses from simply installing them in the structure without tensioning them could cause them to bind. This will result in structural deformation and a reduction in the bolts’ load-bearing capacity. As a result of the rust, more torque is necessary to tighten the bolts, which will eventually break or loosen them.

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