Description
Technical Parameters
Nabla Clip Fastening System - Technical Specifications
| Category | Parameter | Details | Values/Standards |
|---|---|---|---|
| Basic Info | Type | Elastic rail fastening clip (self-retaining) | Nabla Clip (KPO, KPW series) |
| Manufacturer | Vossloh, Pandrol, or licensed local producers | - | |
| Design Features | Shape | Omega-shaped (∇) spring steel design | No nuts/bolts required |
| Installation Method | Tool-free (manual press-in) or light hammering | <20 sec per clip | |
| Reusability | Fully removable and reusable | Up to 5 reuses recommended | |
| Mechanical | Toe Load (clamping force) | 8-12 kN per clip | EN 13481 compliant |
| Lateral Resistance | 40-60 kN per fastening point | Depends on sleeper type | |
| Fatigue Life | >3 million cycles (at 2× design load) | DIN 45672 tested | |
| Materials | Clip Material | High-carbon spring steel (60Si2MnA) | Yield strength: ≥980 MPa |
| Surface Treatment | Zinc-aluminum coating (ZnAl15) | Corrosion resistance: >30 years | |
| Insulator Material | Glass fiber reinforced nylon (GF-PA66) | Dielectric strength: 25 kV/mm | |
| Compatibility | Rail Types | UIC 54/60, BS 80A-100A, AREMA 115RE-136RE | - |
| Sleeper Types | Concrete (B70/B90), wooden, or steel sleepers | Requires appropriate shoulder design | |
| Standards | Europe | EN 13481-5, DIN 45672-3 | TSI approved for EU networks |
| North America | AREMA Chapter 30, Class 1 fasteners | Compatible with FRA regulations | |
| Asia | TB/T 3395 (China), JIS E 1101 (Japan) | CRCC certified | |
| Applications | Track Types | Ballasted tracks, low-vibration urban transit | Tram, metro, conventional rail |
| Special Use Cases | Turnouts (with modified shoulder plates) | Limited high-speed applications | |
| Performance Data | Temperature Range | -40°C to +80°C operational | Maintains 85% toe load at extremes |
| Electrical Isolation | ≥5 kΩ resistance (clip-to-sleeper) | EN 50122-1 compliant | |
| Axial Stiffness | 25-35 kN/mm per fastening point | Measured at 2 mm deflection |
Advantages vs Limitations
| Advantages | Limitations |
|---|---|
| ① Rapid installation (50% faster than SKL) | ① Lower clamping force vs. Fastclip |
| ② No loose parts (vandal-proof) | ② Not suitable for >160 km/h mainlines |
| ③ Low maintenance requirements | ③ Limited heavy-haul capability |
| ④ Excellent vibration damping | ④ Requires precise rail shoulder tolerances |
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