Nabla Clip Heavy Duty Rail

Railway Clip is used to fasten the rails to the underlying base plate together with the concrete sleeper. A variety of different types of heavy-duty clips are used to fasten the rails to the underlying baseplate or Sleeper, one common being the E Clip, which is shaped like a stubby paperclip. Another one is the SKL Tension Clamp, which is also the most widely used type all over the world. Others like KPO Clamp and Nabla Clip, also used in different situations.

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Description

Technical Parameters

Rail Nabla Clip Fastening System

The Railway Nabla Clip is a resilient plate-spring fastening component characterized by its distinctive inverted delta (∇) shape, engineered to secure rails to concrete sleepers through controlled elastic clamping action . Manufactured from high-strength spring steel grades including 60Si2MnA and 60Si2CrA with thickness options of 4mm or 4.5mm, these clips achieve through-hardness of 42–47 HRC and fatigue life exceeding 5 million cycles without failure .

Technical Specifications:

Component	Material	Key Specifications	Function
Nabla Clip	60Si2MnA / 60Si2CrA	4–4.5mm thick; 42–47 HRC; 5M cycles fatigue life	Primary elastic clamping element
Insulator	PA66+30% Glass Fiber	Tensile ≥170 MPa; Insulation ≥1×10⁸ Ω	Electrical isolation & gauge adjustment
Screw Spike	35# Steel (Grade 5.6)	Tensile ≥500 MPa; Yield ≥300 MPa	Secure clip to sleeper
Spring Washer	ML08AI	18.25×34×78mm; C:0.05-0.10%	Maintain clamping tension

Installation & Maintenance Perspective:

Complete fastening assembly comprises 2 Nabla clips + 2 insulators + 2 screw spikes + 2 spring washers per rail seat .
Reinforced nylon insulators (PA66+30%GF) deliver tensile strength ≥170 MPa and insulation resistance ≥1×10⁸ Ω .
Screw spikes (Grade 5.6, 35# steel) provide tensile strength ≥500 MPa with 90° cold bend capability .

Maintenance & Operational Perspective

Clamping force maintained through 5 million fatigue cycles without failure .
42–47 HRC hardness ensures wear resistance at rail contact points .
Elastic deflection capacity accommodates thermal expansion from -40°C to +80°C .
Suitable for light rail, passenger traffic, freight, mixed traffic, and heavy haul routes .
Impact load attenuation protects sleepers from dynamic train-induced stresses .

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