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The Vossloh SKL 12 rail clip—widely known as the SKL 12 tension clamp or elastic W-clip—is a high-performance fastening component engineered for total compatibility with designated configurations of the global Vossloh SKL rail fastening system.
Unlike conventional clips, the SKL 12 is uniquely optimized as a ballastless track fastener designed primarily for sleeper track panels or slab tracks without concrete retaining shoulders. It is heavily utilized across urban transit networks (subways and light rails) and mainline high-speed railways where high-frequency vibrations occur
Vossloh SKL 12 System Compatibility & Structure
To deliver reliable vertical clamping force (toe load), vibration damping, and secure electrical insulation, the SKL 12 operates as part of an integrated, separate-type railway fastening assembly. It interfaces seamlessly with the following key components:
1. Ballastless Slab Tracks & Wooden Sleepers
The SKL 12 clip is a premier choice for ballastless concrete slab tracks and transit systems requiring an independent clamping mechanism. Additionally, it is integrated into the classic System KS to convert and upgrade traditional wooden sleepers on ballasted tracks.
2. Ribbed Iron Baseplates
Because the track panel lacks concrete shoulders, the SKL 12 must be mounted on a ribbed iron baseplate (tie plate). The ribbed baseplate features built-in rail shoulders and specialized T-bolt insertion seats to securely ground the clip.
3. T-Bolts, Screw Spikes & Eccentric Tapers
The SKL12 system employs a dual-anchoring structural design:
· Clip Fastening: The elastic clip is held down using HS32/26-M22 T-bolts paired with flat washers and hex nuts, tightened to a strict maximum torque specification of 200 Nm.
· Baseplate Anchoring: The ribbed plate is anchored down using turnout bolts or Ss35 screw spikes driven into high-density polyethylene (HDPE plastic dowels) embedded in the sleeper.
· Track Adjustments: Lateral and gauge alignment adjustments are executed seamlessly using varying sizes of eccentric heart taper pins rather than shifting concrete parts.
4. Rail Profiles & Resilient Pads
It perfectly accommodates major global steel rail profiles, including standard UIC54, UIC60, 50kg, and 60kg rails. It must be paired with highly elastic intermediate rail pads featuring a static node stiffness of ≥200 kN/mm to minimize dynamic stress.
Technical Specifications of SKL12 Tension Clamps
Every premium SKL 12 rail clip is manufactured to strict international standards (such as DIN17221, EN10089, or GB/T1222) to ensure total failure resistance under high dynamic loads:
Primary Applications of SKL 12 Clips
· Urban Metro & Light Rail Transits: Excellent static stiffness (approx. 70kN/mm) and high-frequency vibration absorption make it ideal for city subways built on ballastless slab tracks.
· Standard Mainlines & Bridges: Frequently applied on bridge structures and trunk railways using the specialized Skl B 12 variant, which reduces creep resistance to safely accommodate bridge expansion.
Sourcing High-Quality SKL12 Rail Clips in China
When purchasing replacement fasteners for a Vossloh-type track network, selecting a manufacturer with rigorous metallurgical testing is vital for safety.
As an established production factory, Signum Rail Fasteners China manufactures premium SKL12 clips that offer 100% geometric and structural compatibility with original Vossloh fastening systems. We provide complete OEM customization based on client technical drawings and support versatile anti-corrosion surface treatments, including plain oiled, oxygen black, zinc-plated, or specialized zinc flake dacromet coating.
Contact Signum Rail Fasteners China today to receive an immediate technical consultation, verified drawing blueprints, or a competitive factory-direct price quote for your next railway infrastructure project!
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