NF F50-015 Nabla Clamp for Railway Fastening

The NF F50-015 Nabla Clamp (also known as a Nabla clip or blade) is a high-performance elastic rail fastener widely used in French TGV high-speed lines and tramway systems across Africa and Europe. 

Kunshan Signum Machinery Technology Co., Ltd. is a trusted supplier of the Nabla Blade, meeting the NF F50-015 Standard for railway and transportation infrastructure.

Key Technical Specifications

• Standard: Compliant with French standard NF F50-015 and European standard EN13481-5.

• Material: Manufactured from high-quality alloy spring steel (e.g., 60Si2MnA, 60Si2CrA, or 38Si7).

• Hardness: Typically ranges between HRC 51–55.

• Performance: Capable of providing a toe load of approximately 2500 DaN and a fatigue life of up to 5 million cycles without cracking.

• Design: It has a distinctive trapezoidal shovel shape with a center hole for a high-strength bolt. 

Components of the Nabla Fastening System

The clamp operates as part of a three-component system:

1. Nabla Plate (Blade): The main elastic component that generates clamping force.

2. Insulator: Specially designed to sit between the rail and the clip to provide electrical insulation and support.

3. High-Strength Bolt Assembly: Includes a double-end bolt (often pressed into concrete sleepers), nut, and washer to secure the clip. 

Applications

• High-Speed Rail: Primarily used on French TGV lines.

• Urban Transit: Heavily utilized in modern tramway systems.

• Geographic Focus: Predominantly found in France, Western Europe, and African railway networks. 

We offer Pandrol flat steel Nabla clip C1 for railway fastening compliant with the NF F 50-015 standard.