SKL Rail Fastening System

The SKL Rail Fastening System is an elastic, direct fastening system widely used in modern railway construction worldwide. It is designed to secure the steel rail to the concrete sleeper tightly while absorbing the high-frequency vibrations generated by passing trains.By utilizing the unique geometry of the W-shaped tension clamp (SKL clamp), this system guarantees a permanent clamping force, preventing rail creeping and ensuring gauge stability even under extreme dynamic loads and harsh weather conditions.

As a professional rail fastener manufacturer, GNEE RAIL is dedicated in manufacturing and supplying various types of SKL fastening systems, rail fasteners and standard railroad components. Ensure track safety and stability with our high-performance SKL Rail Fastening Systems. Engineered for high-speed, heavy-haul, and urban railway tracks, our SKL fastening systems offer superior elasticity, strong clamping force, and exceptional vibration mitigation.

• Standard: EN 13481, DIN, AREMA

• Types: SKL 1, SKL 3, SKL 12, SKL 14, SKL 21 (Customization available)

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The SKL fastening system is a highly elastic, low-maintenance rail fastening assembly designed for secure, durable track fastening, particularly on ballastless, concrete, or wooden sleepers. Its main components include SKL tension clips, screw spikes (Ss series), angled guide plates, rail dowels, and washers, which collectively ensure, lateral/height adjustment and secure rail fastening.

The SKL fastening system is a highly resilient, screw-based railway fastener used globally, primarily for securing rails to concrete sleepers on ballasted and ballastless tracks. It provides high stability, elasticity, and creep resistance, making it suitable for high-speed lines, heavy-haul freight, tramways, and turnouts, with adjustable gauge and height.

Key Applications of SKL Fastening Systems:

• Concrete Sleeper Tracks: Widely applied in high-load, heavy-weight concrete sleeper rail systems, such as SKL3, SKL12, and SKL14.

• High-Speed Railways: Used in tracks designed for high speeds, such as the SKL21 system, which supports speeds up to 300 km/h.

• Ballastless (Slab) Tracks: Employed in ballastless tracks for high stability, frequently used with highly-elastic rail fastening pads in turnouts.

• Tram Lines and Metro Systems: Ideal for urban transit applications like tram lines, offering reliable stability for both open and embedded tracks.

• Turnout Areas: Used in switches and crossings for connecting rail parts, providing robust vertical and lateral support.

• Heavy Haul Lines: Its resilient nature and high clamping force allow it to handle heavy loads effectively.

Core Advantages in Application:

• High Elasticity: Ensures optimal clamping force and protects the track structure.

• Adjustability: Allows for adjustments in track gauge (±10mm) and height (+20mm).

• Easy Maintenance: The screw design simplifies installation and maintenance, reducing costs.

• Electrical Insulation: Components can be configured to provide excellent electrical insulation properties.
   

The SKL rail fastening system is a highly elastic, tension-clamp system optimized for high-speed, heavy-haul, and concrete sleeper tracks, featuring a tension clip, guide plate, and screw spike. Conversely, the KPO rail clamp system is a rigid fastening system using cast iron clamps for heavy-duty applications, often with wooden or concrete sleepers.

Key Differences:

• Elasticity & Structure: SKL uses "Skl" tension clamps (12kN force) to provide high elasticity, cushioning, and vibration reduction. KPO relies on rigid hook bolts and iron clamps, offering higher clamping force but less elasticity.

• Main Application: SKL is favored for high-speed railways, turnouts, and both ballasted/ballastless tracks. KPO is typically used for heavy-duty crane rails and conventional, high-load railway tracks.

• Components: SKL components include the tension clamp, screw spike, guide plate, and rail pad. KPO components include the KPO clamp, bolt, washer, and iron base plate.

Q1: Are your SKL rail fastening systems compatible with our specific rail profiles like UIC 60 or 136 RE?

A: Yes, our SKL systems are highly adaptable. By customizing the dimensions of the angular guide plates and elastic rail pads, we can ensure a seamless and secure fit for standard rail profiles including UIC 54, UIC 60, 115 RE, and 136 RE on concrete sleepers. Please send us your track drawings for precise matching.

Q2: Our track project is located in a coastal area. What surface treatments do you provide to prevent severe rusting?

A: For highly corrosive environments like coastal regions or mining tracks, we strongly recommend our hot-dip galvanized or Dacromet-coated SKL fasteners. These advanced anti-corrosion treatments pass rigorous salt spray tests, significantly extending the service life and reducing your future maintenance costs.

Q3: Track safety is our top priority. How do you guarantee the fatigue strength and clamping force of the SKL clips?

A: Every batch of our SKL tension clamps undergoes strict metallographic analysis and a mandatory 5-million-cycle dynamic fatigue test to guarantee lasting clamping force without fracture. Furthermore, we provide complete Mill Test Certificates (MTC) and welcome third-party inspections (like SGS) before shipment.

Q4: Does the installation of your SKL fastening system require highly specialized equipment?

A: The SKL system is designed for high installation efficiency. While manual installation and tightening using standard torque wrenches are perfectly viable for track maintenance, our system is also fully compatible with automated track-laying machines, which can drastically speed up installation for large-scale new railway projects.

Q5: Why should we choose the SKL system over the traditional E-clip fastening system for our new high-speed track?

A: The SKL system provides a superior, more consistent clamping force and greater resistance to rail creeping, which is critical for high-speed and heavy-haul operations. Its screw-fastened design allows for easier adjustment of track gauge and precise tension control compared to the drive-in style of traditional E-clips.

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As a direct manufacturer, we back our SKL rail fastening systems with verifiable engineering data. Our tension clips are forged exclusively from traceable 60Si2Mn or 38Si7 spring steel, with every batch passing a mandatory 5-million-cycle dynamic fatigue test in our ISO-certified lab.

Supported by automated production lines and an in-house CNC tooling workshop, we ensure stable delivery for large-scale railways and can output custom prototypes in 7 days. Submit your track drawings (CAD/PDF) and required rail profiles, and our engineering team will provide a precise, itemized quotation within 12 hours.

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