Description
Technical Parameters
Nabla Spring Blade
| Category | Parameter | Specification / Description | Remarks |
|---|---|---|---|
| General Information | Product Name | Nabla Spring Blade | Also known as "Lambda Clip" or "∇-shaped clip" |
| Model Number | e.g., RN-18, LMA-20, NLB-16 | Varies by design and application | |
| Application | High-speed rail, heavy-haul railway fastening systems | Used to secure rails to concrete sleepers | |
| Material & Treatment | Base Material | 60Si2MnA / 52CrMoV4 / SUP9 | High-carbon spring steel with excellent elasticity and fatigue resistance |
| Hardness | 42 - 48 HRC (Rockwell C Scale) | ||
| Surface Treatment | Epoxy coating / Zn-Al alloy coating / Phosphating | Anti-corrosion and aesthetic protection | |
| Mechanical Properties | Tensile Strength | ≥ 1570 MPa | |
| Yield Strength | ≥ 1320 MPa | ||
| Clamping Force | 12 - 16 kN (varies by model) | Critical for rail retention |
Key Features & Notes:
- Design: The Nabla (∇) shape provides uniform stress distribution and high elastic recovery.
- Function: Clamps the rail foot to the baseplate/sleeper, ensuring stability and vibration damping.
- Applications: Widely used in high-speed rail networks (e.g., China HSR, European HSR lines).
- Variants: Insulated versions include nylon or composite inserts to prevent electrical current flow between rail and sleeper.
- Testing: Fatigue tested per UIC 864-0/EN 13481 standards to ensure longevity and safety.
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