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The Vossloh SKL 21 rail clip—also known in the global railway industry as the SKL 21 tension clamp or elastic W-clip—is a high-performance fastening component engineered for full structural compatibility with designated configurations of the global Vossloh SKL rail fastening system.
Developed to handle demanding track environments, the SKL 21 is a premium choice for high-load mainlines, urban rapid transit networks, and heavy-freight lines. Its specialized geometry provides high fatigue strength and exceptional resistance to permanent deformation under severe dynamic loads.
Vossloh SKL 21 System Compatibility & Assembly Breakdown
To achieve the optimum vertical clamping force (toe load), long-term track gauge maintenance, and complete electrical insulation, the SKL 21 tension clamp operates as an integrated component within Vossloh track structures. It interfaces seamlessly with the following infrastructure components:
1. Railway Sleepers (Ties)
The SKL21 rail clip is optimized for both concrete sleepers with pre-cast shoulder recesses and specialized ballastless slab track configurations used in modern high-frequency subway or mainline systems.
2. Baseplates & Angled Guide Plates
It pairs seamlessly with ribbed iron baseplates or glass-fiber-reinforced polyamide angled guide plates (rail insulators). These components precisely mirror the lateral shape of the SKL 21 clip, safely transferring high lateral train forces directly to the concrete bearer while keeping the rail perfectly aligned.
3. High-Tensile Screw Spikes & T-Head Bolts
Depending on the specific system configuration, the SKL 21 is anchored using robust fastening hardware:
· Direct Anchoring: Secured directly into concrete sleepers using heavy-duty Ss35 screw spikes driven into high-density polyethylene (HDPE plastic dowels).
· Indirect Anchoring: Bolted onto ribbed iron plates via HS32/26-M22 T-bolts complete with matching hex nuts and flat washers.
4. Rail Profiles & Resilient Elastomer Pads
The clip's footprint easily accommodates a broad array of global steel rail profiles, including standard UIC54, UIC60, 50kg, and 60kg rail sections. It works in tandem with resilient elastomer rail pads to absorb impact vibrations and ensure total electrical insulation (>5kΩ) across active signaling blocks.
Technical Specifications of SKL21 Tension Clamps
Every premium SKL 21 rail clip must be manufactured to stringent international railroad standards (such as DIN17221, EN13481, or GB/T1222) to resist structural fatigue under intense axle loads.
Primary Applications of SKL 21 Clips
· Mainline Trunk Railways: Provides excellent resistance to rail creep, making it highly effective on lines handling frequent, mixed passenger and freight operations.
· Urban Subway & Metro Systems: Its robust vertical damping properties absorb high-frequency vibrations, reducing urban noise pollution and protecting surrounding concrete slab track structures.
Sourcing High-Quality SKL21 Rail Clips in China
When purchasing replacement fasteners for a Vossloh-type track network, procuring components with strict metallurgical testing is vital to prevent catastrophic track-laying failures.
As a prominent railway track material factory, Signum Rail Fasteners China manufactures premium SKL21 clips and comprehensive fastening sets that offer 100% geometric and operational compatibility with original Vossloh fastening systems. We support custom OEM configurations and offer premier anti-corrosion protective coatings, including plain oiled, black oxide, hot-dip galvanization, and multi-layer zinc flake Dacromet coating engineered to withstand extreme environmental conditions.
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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