Description
Technical Parameters
Nabla Clips (∇-Shaped Elastic Rail Clips)
| Category | Technical Definition | Standards | Key Parameters |
|---|---|---|---|
| Basic Concept | Self-locking, omega-shaped (∇) elastic clips providing constant toe load without bolts/nuts. | EN 13481-5, UIC 864 | Tool-free installation |
| Primary Function | - Maintain rail-to-sleeper clamping force (8-12 kN) - Damp vibrations - Resist lateral forces (35-50 kN) |
DIN 45672 | Fatigue life: >3M cycles |
| Material | Steel: 60Si2MnA spring steel (EN 10089) Coating: ZnAl15 (80-120μm) or AISI 304 stainless |
ISO 1461, ASTM A153 | Hardness: 44-48 HRC |
| Design Features | - Asymmetric ∇-shape - No loose parts (vandal-proof) - Reusable (≤5 times) |
TSI INF 130/2014 | Clip height: 42-48mm (installed) |
Nabla Clip Series Comparison
| Model | Clamp Force | Length | Coating | Service Life | Best For |
|---|---|---|---|---|---|
| KPW-12 | 8-9 kN | 140mm | ZnAl15 | 15 years | Light rail/tram |
| KPW-14 | 10-11 kN | 145mm | ZnAl15 + epoxy | 20 years | Metro/conventional rail |
| KPO-16 | 11-12 kN | 160mm | Stainless steel | 25+ years | Coastal/high-humidity |
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