SKL Tension Clamps, Rail Clip, Railway Fasteners, China

SKL Tension Clamps are integral components used in the Vossloh SKL fastening system to secure the rail to the concrete tie or baseplate. These clamps help maintain rail stability, especially under the tension forces that occur in high-speed and heavy-duty rail systems.

Key Models and Applications

Vossloh produces several types of SKL clamps, each tailored to specific track requirements:

SKL 14 (System W 14):

• Application: The most widely used system globally for ballasted tracks, suitable for conventional and high-speed rail up to 320 km/h (198 mph).

• Features: Developed to withstand frequent braking and acceleration forces; helps damp vibrations and reduce noise when paired with a cellentic rail pad.

SKL 12 (System W 12):

• Application: Primarily used in ballastless (slab) tracks, common in metro and light rail systems.

• Features: Designed for sleeper track panels without concrete shoulders, it allows for horizontal and vertical adjustments and reduces vibration transmission.

SKL 21 (System W 21):

• Application: Used for conventional and high-speed traffic (up to 300 km/h or 186 mph), offering high rail creep resistance.

• Features: Features a long spring deflection, which keeps the spring arms in contact with the rail base even under dynamic loads, ensuring high fatigue strength.

SKL 24 (System KS 24):

• Application: Used in ribbed plate systems on various sleeper types (wooden, concrete, steel, plastic), with a maximum speed of 250 km/h (155 mph).

• Features: Its flat geometry allows for installation within the rail joint area and can provide higher electrical resistance with an additional insulator.

• M-Generation (M9/M12): A newer series with an "M" shape, designed for increased contact area, higher fatigue strength, and reduced lifecycle carbon footprints. 

Technical Specifications

SKL clamps are engineered from durable materials to meet rigorous railway standards.

• Material: High-quality spring steel(60Si2MnA or 38Si7)

• Hardness: 42–47 HRC (Rockwell Hardness C scale).

• Clamping Force: 10–15 kN per clip.

• Fatigue Life:Over 5 million cycles without breaking. 

System Components

The SKL clamp works as part of a complete fastening system, which also includes:

• Screw Spike: Used to fasten the assembly to the sleeper or track plate.

• Plastic Dowel: An insert for concrete sleepers that provides insulation and a secure anchor for the screw spike.

• Angled Guide Plate (Insulator): Maintains the rail's lateral position and provides electrical insulation.

• Rail Pad: An elastic mat (often cellentic elastomer) placed between the rail and sleeper to dampen vibrations, reduce noise, and protect the sleeper.