Tension Control Bolts system enables the cost-effective and safe installation of pre-tensioned bolts simply and quickly. One person can independently install and tighten the connection.
Tension Control Bolts system enables the cost-effective and safe installation of pre-tensioned bolts simply and quickly. One person can independently install and tighten the connection.
TCB – Tension Control Bolts: lowest cost method for pre-loaded joints

TCB screws are designed for easy and quick installation that meets demanding pre-tensioning requirements without additional tools. The geometric and torque mechanical properties of the screws ensure the correct pre-tensioning, and the success of the installation can be visually verified. A quiet and non-impact electric screwdriver allows for the installation of different diameters with a single tool, which enhances work safety and installation efficiency.
COST-EFFECTIVE WAY
See how the TCB, Tension Control Bolts, system allows you to install pre-tensioned friction joints quickly and efficiently. This installation video demonstrates how one person can easily carry out the entire installation process, including tightening the joint. The TCB system is the most economical way to properly install pre-tensioned friction joints.
TCB meets the latest standards for steel frame construction
The TCB fastening is a fastening solution in accordance with the Eurocode system (EN 14399-10) for pre-tensioned friction joints. TCBs meet the strength class 10.9 / 10 requirements and achieve the pre-tension values presented in EN 1090-2, making them interchangeable with other fastening systems.

Below are some examples of the numerous applications of the TCB system:
The TCB can also be used for connections that only transmit shear forces. In these applications, the undeniable advantage of the TCB fastening system is its quick installability.
Advanced installation and tightening method


Quick, easy and safe
TCB is extremely quick, easy and safe to install. One man can install and tighten the joint. Visual inspection can be easily done to check whether the joint has been manufactured or not. With one shear wrench several dimensions can be installed just by changing the socket of a right size.
For limited space installation there are available sophisticated tools to complete the job. With non impacting electrical shear wrenches there is no risk for hand-arm vibration syndrome.
With TCBs, consistent tension is achieved in the joint which do not loosen with vibration. No additional locking elements are needed.
There is no risk of bolt relaxation since no torsional shear is induced during tightening.
Determination of bolt length is done from the enclosed table.

High performance yet environment friendly Greenkote coating
Greenkote is a new innovative diffusion coating developed for the corrosion protection of TCBs. The process is a thermochemical surface modification and can be used for various metals, alloys, sintered ferrous-based materials, grey iron and cast iron.
• Totally environment friendly.
• Salt spray resistance up to 1200 hours.
• No risk of hydrogen embrittlement.
• Long-term corrosion protection up to 400 °C.
• Coating thickness uniformity +/- 5 microns.
• Excellent preparation for painting.
• Greenkote does not include forbidden chrome VI or chrome III particles.