Description
Technical Parameters
SKL Clips
| Feature | Description |
|---|---|
| Primary Function | To clamp the rail foot to the sleeper (concrete or steel), maintaining track gauge and restraining rail movement. |
| Key Principle | Elastic fastening. It acts as a spring, applying a consistent clamping force that absorbs vibrations and allows for thermal expansion. |
| Common Names | SKL Clip, Nabla Clip, Wire Clip, Spring Wire Clip. "SKL" is a trademark held by the Vossloh Group. |
| System Components | 1. The SKL Clip itself (a hardened steel wire). 2. The SKL Tension Washer (a specially shaped plate). |
| Advantages | Simple design, easy installation and removal, good elasticity, reliable performance, low maintenance. |
| Disadvantages | Generally lower clamping force compared to robust E-clips; may require more frequent re-tensioning in very heavy-haul applications. |
Detailed Specifications & Types Table
| Aspect | Description & Details |
|---|---|
| Material | Made from high-carbon spring steel wire rod, which is heat-treated (quenched and tempered) to achieve high elasticity and fatigue resistance. |
| Key Parameters | • Toe Load: The clamping force applied to the rail foot (e.g., 5-8 kN). • Deflection: The deformation of the clip when installed, which generates the toe load. |
| Common Types/Variants | • Standard SKL Clip: The most common type. • SKL 12, SKL 14, etc.: Variants with different wire thicknesses (12mm, 14mm) for different load requirements. • Insulated SKL Clip: A version with a plastic coating or sleeve to provide electrical insulation for track circuit signaling. |
Comparison with Other Common Fasteners
| Fastener Type | Principle | Comparison with SKL Clip |
|---|---|---|
| Dog Spike | Rigid fastening for wooden sleepers. | SKL is superior: Elastic, higher holding power, maintains tension, suitable for concrete sleepers. |
| E-Clip (e.g., Pandrol) | Elastic fastening; a robust, stamped spring steel clip. | E-Clip typically has a higher toe load. SKL clip is generally easier and faster to install/remove with automated machinery. The choice depends on specific track requirements. |
| Screw Spike | Rigid fastening; threads into the sleeper. | SKL is superior: Faster installation, elastic damping, |
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