SKL clips are manufactured from high-quality spring steel subjected to a specialized heat-treatment process, they feature a distinctive "W" shape. By utilizing the elastic deformation of the spring steel, they exert a clamping force that securely holds the rail onto the sleeper or track slab, effectively maintaining the track gauge and preventing longitudinal or lateral rail displacement, as well as rail overturning.

 

The SKL clips is not a single product, but rather a family of elastic fastening components designed for various track operating conditions. Common models currently in use include the SKL-1 clip, SKL-3 clip, SKL-12 clip, SKL-14 clip, and SKL-15. These models differ in terms of clamping force, geometric dimensions, compatible rail types, and applicable line classifications, allowing them to accommodate diverse axle loads, speeds, and track environments.

Among these, the SKL 12 and SKL 14 are the most widely utilized specifications, frequently employed in high-speed railways, heavy-haul railways, and urban rail transit systems.

 

Key Models and Typical Applications

 

• SKL-14 clip (W14 System): The most globally prevalent fastening system for ballasted track, suitable for conventional railways as well as high-speed lines with operating speeds of up to 320 km/h. It is specially engineered to withstand forces generated by frequent train braking and acceleration; when paired with elastic rail pads, it effectively reduces vibration and noise.

 

• SKL-12 clip (W12 System): Primarily used for ballastless (slab) track, commonly found in metro and light rail systems. It is designed for track slabs lacking concrete shoulders, supports both horizontal and vertical adjustment, and helps minimize vibration transmission.

 

• SKL-15 clip (W300 System): Developed specifically for ballastless high-speed tracks with speeds up to 350 km/h, this model is intended for lines that demand higher clamping forces and superior fatigue resistance.

 

• SKL-21 clip (W21 System): Suitable for both conventional and high-speed lines (up to 300 km/h), this model offers high resistance against rail creep. Its design provides significant elastic deflection, ensuring that the clamp arm remains in contact with the rail base even under dynamic loading, while also delivering high fatigue strength. 

 

• SKL-24 clip (KS24 System): A rail fastening system designed for use with various types of sleepers—including timber, concrete, steel, and plastic—suitable for operating speeds of up to 250 km/h.

 

High-Quality Materials and Superior Performance: The SKL clips is manufactured from high-strength alloy spring steel (common grades include 60Si2MnA, 38Si7, etc.) with a hardness of approximately HRC 42–47. Through precision forming and heat treatment, the clamps achieve exceptional elasticity and high fatigue resistance.

 

Global Application and Industry Recognition: Fastening systems from Henan Xinda Railway Equipment Co., Ltd. are utilized in numerous countries across high-speed, heavy-haul, conventional, and urban rail transit networks. As the core elastic component of these systems, the SKL clips—renowned for its reliable clamping force, outstanding fatigue resistance, and maintenance-free design—stands as one of the most widely used rail fastening components globally.

A classic bolted elastic rail clip with stable toe load and good creep resistance, fitted for concrete sleepers and widely used on ballasted tracks and continuous welded rails.