Description
Technical Parameters
Rail nabla clip Fastening System
The Railway Nabla Clip (∇-Clip) is a resilient plate-spring fastening component distinguished by its inverted triangular delta shape, engineered specifically for ballasted track systems requiring robust clamping with minimal maintenance intervention. Manufactured from high-grade spring steel alloys including 60Si2MnA, 60Si2CrA, and 55Si2Mn, these clips achieve hardness ratings of 42–47 HRC and fatigue life exceeding 5 million cycles without failure . T
Technical Specifications:
| Parameter | Standard Duty | Heavy Haul | C1 System (EN Category C) | Test Method |
|---|---|---|---|---|
| Material Grade | 60Si2MnA | 60Si2CrA | 60Si2Mn / Hot-Rolled Spring Steel | Spectrographic Analysis |
| Hardness (HRC) | 42–46 | 44–48 | 41–46.5 | Rockwell HRC |
| Thickness | 4.0 mm | 4.5 mm | 4.0–4.5 mm | Micrometer Measurement |
| Clamping Force / Toe Load | 8–11 kN | 12–14 kN | Per design requirements | Load Cell Testing |
| Fatigue Life | 5 Million Cycles | 5 Million Cycles | 200 Million Cycles | Dynamic Test Rig |
| Longitudinal Rail Resistance | ≥7 kN | ≥9 kN | ≥7 kN | EN 13146-1 |
Installation & Maintenance Perspective:
- Spring Steel Grades: Available in multiple alloy compositions including 60Si2MnA (standard duty), 60Si2CrA (enhanced fatigue resistance), and 55Si2Mn (cost-effective general purpose), each with carbon content of 0.52–0.64% and manganese 0.60–0.90% for optimal spring properties .
- Hardness Range Control: Precision heat treatment achieves through-hardness of 41–47 HRC (Rockwell C scale), verified through cross-sectional microhardness mapping to ensure consistent properties from surface to core .
- Thickness Configurations: Available in 4.0 mm and 4.5 mm plate thickness options, with the thicker variant providing increased clamping force (12–14 kN) for heavy-haul applications requiring greater longitudinal restraint .
Maintenance & Operational Perspective
- Four-Component System: Complete fastening comprises Nabla clip (2 pcs), reinforced nylon insulators (2 pcs), screw spikes (2 pcs, typically M22 or Tr22×160), and spring washers (2 pcs) per rail seat, all designed for integrated mechanical performance .
- Insulator Engineering: PA66+30% glass fiber insulators deliver tensile strength ≥170 MPa, bending strength ≥250 MPa, and impact strength ≥80 KJ/m², with glass fiber content precisely calibrated to 30–35% for optimal mechanical-electrical property balance .
- Shoulder Housing Compatibility: Designed specifically for cast-in shoulders with Nabla-shaped housing profiles that guide clip legs during installation and provide positive lateral restraint during service .
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