Elastic Nabla Clips for Railway Fastening System

Elastic Nabla clips (also known as Nabla blades) are specialized intermediate fasteners used to secure steel rails to concrete sleepers. Primarily utilized in high-speed rail networks, such as the French TGV, they are designed to maintain track gauge and absorb dynamic forces. 

Key Functions

• Fastening and Stability: Securely anchors the rail to the sleeper to prevent vertical, longitudinal, and lateral movement.

• Load Absorption: Disperses vibrations and shock forces from passing trains, ensuring ride smoothness and protecting the track infrastructure.

• Clamping Force: Generates a dynamically stable toe load on the rail foot when the anchor screw or nut is torqued to specification. 

Technical Specifications

System Components

A complete Nabla fastening assembly per rail seat usually includes:

• Nabla Clips: 2–4 pieces depending on the specific system configuration.

• Insulators: Provide electrical insulation and lateral adjustment.

• Anchor Screws/Bolts: Often double-ended bolts or coach screws.

• Rail Pads: Resilient material placed under the rail to dampen vibration. 

Advancements: NABLA Evolution

• Modern variants like the NABLA Evolution offer enhanced performance for tight radius curves and improved electrical insulation (exceeding 10 K Ohms). These systems use glass-reinforced lateral insulators to increase mechanical strength and simplify maintenance. 

Nabla Clips By Signum 

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

• With years of experience in providing high-quality rail fastening components, Signum specializes in offering Nabla clips that conform to the strict requirements of the NF F50-015 standard, ensuring optimal performance and safety in rail applications.

• Our Nabla clips are engineered for precision and reliability, and we ensure that all our products undergo rigorous quality control to meet international standards. The NF F50-015 standard is known for its comprehensive specifications on durability and safety, making our blades an excellent choice for rail networks requiring high-performance solutions.

• As a dedicated supplier, we offer both competitive pricing and reliable delivery. Our commitment to customer satisfaction and adherence to industry standards has made us a trusted partner in the rail sector.