Sintex Friction Shims

High Torque applications

Assembly of large mechanical construction is often done with large number of bolts that are tightened with very high forces in order to avoid slippage. This can cause breakdown due to fatigue of the tightened bolts and can be very costly in repairs and stoppage time. Within the world of mechanical construction there are lots of machines that has to transfer torque from one shaft to another, and with electrification and down-sizing, the demands for higher torque density is strongly growing. It has been known for many years that the use of friction shims with high roughness and very high hardness can increase the friction coefficient in the assembly zone, but difficulties in measuring the friction in real applications combined with a high price has been an obstacle for many applications.

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Sintex Friction Shims

At Sintex we have developed a new generation of Friction Shims based on hardmetal particles that can penetrate the surface of the bolted flanges and hence secure that they are mechanically locked with a friction that is at least 3 times higher. This can be seen on the demonstration video we have made on a simple construction in order to prove the solution.

Link to Youtube video: https://youtu.be/cMK5YTlgXOw

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Friction Shims can be used in order to ensure a proper tightening of two mating surfaces and removes the risk of the bolts or tightening mechanism to become loose due to vibrations and/or shocks.


A well-known application for friction plates can be found in the marine industry, where the coupling between the crankshaft and the propeller shaft is secured with thermal coated friction plates. But Sintex have also delivered Friction Shims for other large industries where a potential to reduce weight is of great importance. Feel free to contact us in order to learn more about Sintex Friction Shims.

On the photo you can see a 9 cylinder two-stroke gas engine with a cylinder diameter of 900 mm developed by MAN Energy Solutions 

We are often asked if the hard metal particles will fall of when the mechanical loads are high. In order to show the strength and flexibility of a Sintex Friction Shim we have made a little video showing what is possible. Take a look here: https://youtu.be/TW8etucgyqU

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Why should you choose Friction Shims from Sintex?

  • Flexible and cost-effective coating
  • Surface with a hardness around 1000 HV 0,3
  • Particle hardness up to 2600 HV
  • Unique surface - High-innovative grip technology
  • Reduce number and size of bolts
  • 3 times higher friction coefficient
  • Increase performance
  • Transfer higher torque
  • Reduce the risk of slippage
  • Increase the margin of safety
  • Avoid fatigue brakeage of bolts
  • Reduce the weight of your construction

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