Advantages of Railway Nabla Clips
Railway Nabla Clips, named after their resemblance to the nabla symbol (∇), are a type of elastic rail fastening clip renowned for their simplicity, robustness, and high performance. They are also widely known as Fast Clips.
The following table outlines the key advantages and characteristics of the Nabla Clip system.
| Feature / Advantage | Description |
|---|---|
| Name & Shape | Nabla Clip, Fast Clip. Characterized by its symmetric, inverted "V" or nabla (∇) shape. |
| High and Stable Clamping Force | Provides a high initial toe load that remains consistent, ensuring secure rail retention and excellent resistance to longitudinal rail movement (creep). |
| Exceptional Robustness | The one-piece, symmetric design has no small or fragile components, making it highly durable and resistant to damage during handling and installation. |
| Effective Vibration Damping | The clip's elasticity effectively absorbs vibrations and shock impacts from passing trains, protecting the track foundation and reducing noise. |
Key Takeaway
The Railway Nabla Clip (Fast Clip) is a benchmark in rail fastening technology. Its success is built on a foundation of simplicity, strength, and reliability. It is a premier choice for applications demanding a high-clamping-force, low-maintenance solution that is fast to install.
|
Parameter |
Nabla 1 (Universal Mainline) |
Nabla 2 (Heavy-Haul Railway) |
Nabla 3 (High-Speed Railway) |
|
Model Designation |
Nabla 1 |
Nabla 2 |
Nabla 3 |
|
Applicable Rail Profile |
UIC 54 (43kg/m), UIC 60 (60kg/m) |
UIC 60 (60kg/m), 75kg/m Heavy-Haul Rail |
UIC 60 (60kg/m), CRH High-Speed Rail (60kg/m) |
|
Base Material |
60Si2MnA Spring Steel |
55SiMnVB Alloy Spring Steel |
60Si2CrVA High-Strength Spring Steel |
|
Heat Treatment |
Quenching (870–890°C) + Tempering (420–460°C) |
Quenching (870–890°C) + Tempering (430–470°C) |
Quenching (880–900°C) + Tempering (440–480°C) |
|
Mechanical Properties |
- Hardness: HRC 43–48- Tensile Strength: ≥1370 MPa- Yield Strength: ≥1275 MPa- Elongation (δ₅): ≥5% |
- Hardness: HRC 45–50- Tensile Strength: ≥1570 MPa- Yield Strength: ≥1470 MPa- Elongation (δ₅): ≥4.5% |
- Hardness: HRC 46–52- Tensile Strength: ≥1765 MPa- Yield Strength: ≥1665 MPa- Elongation (δ₅): ≥4% |
Comparison with Other Major Clip Types
| Feature | Nabla Clip (Fast Clip) | SKL Clip |
|---|---|---|
| Visual Shape | Symmetric inverted "V" or Nabla (∇). | Asymmetric "Z" or "S" shape. |
| Installation Method | Stretched vertically over a shoulder. | Twisted/Rolled laterally into a housing. |
| Key Characteristic | High initial load, mechanical simplicity, and robustness. | Superior fatigue resistance from the "rolling-in" process. |
| Typical System | Often used with Pandrol or other baseplate systems. | Often integrated into the sleeper shoulder (e.g., Vossloh W-type). |
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