The Nabla rail clip (also known as a Nabla blade or Nabla plate) is a critical elastic component within the Nabla rail fastening system, designed to secure rails to sleepers or baseplates. As a type of spring-based fastener, its unique structural geometry generates a stable clamping force, maintains the track gauge, and absorbs vibrations generated by passing trains.
Structural Characteristics: The Nabla clip resembles a thick, trapezoidal blade with a central circular hole for a mounting bolt. When tightened using a high-strength bolt and nut, this specific shape exerts a consistent “toe load” on the rail, providing a reliable, sustained clamping force that resists rail displacement caused by train traffic. Nabla clips are typically manufactured from high-quality alloy spring steel, in accordance with the French national standard NF F50-015.
Materials and craftsmanship: Nabla clips are primarily made from high-strength alloy spring steel; common material grades used in China include 60Si2MnA, 60Si2CrA, 55Si2Mn, and 38Si7. The production process involves several stages: raw material preparation, shearing, heating, forming, quenching, tempering, inspection, and packaging.
Key Advantages of Nabla clips: stable clamping force; excellent elasticity and high fatigue resistance; superior gauge-holding capability; effective absorption of lateral forces; compatibility with various rail profiles; and overall system safety and reliability.
Applications: High-speed railways; urban rail transit; heavy-haul railways (freight lines); conventional mainline railways (widely used across Europe, Africa, and other regions globally); and tracks in mining areas and ports.
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