Fastening Systems

SKL

Pandrol SKL is a resilient, screwed-direct fastening for concrete sleepers. Simple, reliable and safe, it is a proven solution for ballasted track in many countries.

The rail seat assembly is typically made up of two tension clamps (SKL clips) on top of angled guide plates each side of the rail. The guide plates are located in recesses on the concrete surface, securing the rail horizontally and transferring lateral loading to the sleeper. A pad under the rail provides a layer to attenuate impact and electrical resistance. Everything is held down with screws in concrete dowel inserts.

Custom configurations are possible, for example for dual gauge and turnout sleepers. Theft-resistant screw heads are also available.

Technical Features

  • Changing the size of the angled guide plates enables the rail to be moved laterally in the rail seat to achieve a wider or narrower gauge as required
  • By simply reducing or increasing installation torque of the screw within limits, the clamping force can be varied
  • The fastening can be pre-assembled on sleepers in the factory and transported as a complete unit. Once on site, the SKL clips simply need to be loosened and moved from parked position to working position after the rail has been threaded, then fully torqued up

Advantages

  • The gauge can be adjusted simply by swapping components. This removes the need for different sleepers when gauge widening or redemption is needed
  • Captive fastening reduces handling and, as a result, the risk of losing components. Efficient installation and maintenance saves time and money
  • The ability to vary clamping force means that longitudinal restraint can be changed where necessary for specific areas of track
Fastening Systems

SKL