Description
Technical Parameters
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Rail SKL clip Fastening System
A Railway SKL Clip is a precision-forged, omega-shaped tension clamp fabricated from high-grade spring steel alloys such as 38Si7 or 60Si2CrA, designed for screwed-direct fastening systems on concrete sleepers . Unlike free-standing clips, the SKL operates within a guide plate assembly, where its legs are deflected and retained by shoulders while a screw secures the central loop . This configuration transforms torque into sustained clamping force, providing high longitudinal restraint and overturning protection while allowing pre-assembly at sleeper factories for mechanized track laying .
Technical Specifications:
| Feature Category | Key Benefit | Common Application |
|---|---|---|
| Heat Treatment | 42-47 HRC hardness with shot-peened surface | High-speed lines (>250 km/h) |
| Factory Pre-assembly | Reduced on-site handling and installation time | Mechanized track laying projects |
| Overturning Stop | Central loop prevents plastic overload damage | Steep gradients & sharp curves |
| Resonance Management | 500-560 Hz mode identification for corrugation control | Corrugation-prone sections |
| Adjustable Stiffness | 22.5-500 kN/mm via pad selection | Transition zones & vibration-sensitive areas |
| Removable Dowels | Replaceable inserts without sleeper replacement | High-frequency urban transit |
Installation & Maintenance Perspective:
- Manufactured from silico-manganese spring steels with controlled carbon content for deep hardenability .
- Undergoes oil quenching from 910°C followed by tempering at 455°C to achieve 42-47 HRC hardness range .
- Shot-peening treatment introduces compressive residual stresses at the surface to retard crack initiation .
- Microstructural uniformity verified through Vickers hardness profiling across the cross-section .
Maintenance & Operational Perspective
- Features captive fastening design where clips remain tethered to sleeper during rail threading and installation .
- Factory pre-assembly capability enables high-speed mechanized track laying without on-site component handling .
- Installation requires moving clip from "parked position" to working position after rail insertion, then torquing .
- Central loop acts as integrated overturning stop, contacting rail only when arms are overloaded .
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