Description
Technical Parameters
Railway Nabla Clip - Technical Specification & Identification
| Parameter | Description & Details |
|---|---|
| Product Name | Elastic Rail Clip (Nabla Type) |
| Common Names | Nabla Clip, K Clip (in some regions due to its shape) |
| Primary Function | To clamp the rail foot to the sleeper/baseplate, providing vertical force and longitudinal restraint. Its design offers a progressive spring characteristic. |
| Applicable Rail Sections | UIC 60E1, UIC 54E1, and other common rail profiles. The clip itself is often universal for a range of sections. |
| Standard Material | High-Carbon Spring Steel (e.g., Grade 60Si2MnA, 60CrA). |
| Material Standard | European Standards: EN 13479, EN 13481. German Standards: TL 91871. |
Railway Nabla Clip - Application, Handling & Comparison
| Aspect | Details |
|---|---|
| Application System | Core component of the Nabla Fastening System (also historically called the K Fastening System). Used on concrete sleepers. |
| Installation Method | Hammer Blow. The clip is placed into its cast-in shoulder and driven home with a few strikes from a special hammer or an automated tool. |
| Installation Tool | Specialized Hammer (manual) or Hydraulic Installation Arm on a tamper/regulator machine. |
| Inspection (Maintenance) | Regular visual checks for: - Cracks: Especially at the bend points. - Corrosion: Loss of protective coating. - Permanent Deformation: A flattened clip that has lost its tension. - Correct Seating: Ensuring the clip is fully seated in its shoulder and against the rail foot. |
Visual Comparison of Clip Profiles
- Nabla Clip: Resembles an inverted "V" or the Greek letter Nabla (∇). It is made from a single strip of flat spring steel.
- Fastclip: Has a more complex, asymmetrical shape with a distinct "toe" for applying force to the rail foot.
- E-Clip: Resembles a squared-off, asymmetrical "E" shape.
- SKL Clip: Resembles a squared-off letter "B" and is made from round steel wire.
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