Name: China Nabla Clip For Railway Fastener Manufacturers Suppliers Factory - Gnee Steel
Brand: GNEE
SKU: 296340613

Nabla Clip For Railway Fastener

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

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Rail Nabla CLIP Fastening System

The Railway Nabla Clip is a triangular-profile elastic fastening component that generates clamping force through controlled torsional deflection of its spring steel legs. Named after the Greek letter ∇ (nabla) for its distinctive shape, it creates a multi-directional restraint system that simultaneously secures the rail vertically, laterally, and longitudinally while maintaining electrical insulation through integrated composite components . Originally developed for challenging track conditions, it employs a unique geometric design to convert vertical deflection into both horizontal clamping force and downward pressure simultaneously

Technical Specifications:

System Component	Material Specification	Quantity Per Rail Seat	Key Performance Indicator
Nabla Clip	60Si2MnA / 60Si2CrA Spring Steel	2	42-47 HRC / 3 million cycles fatigue life
Insulator	Reinforced Nylon 66 (30-35% Glass Fiber)	2	≥1×10⁸Ω insulation resistance / Tensile strength ≥170Mpa
Screw Spike	Grade 5.6: 35# Steel	2	≥500 MPa tensile strength / 90° cold bend without crack
Spring Washer	ML08Al Steel	2	18.25×34×78mm dimensions
Clamping Force	11-13 kN (horizontal) / 3-4 kN (vertical)	-	Superior creep resistance on gradients >1.5%
Operating Temperature	-30°C to +70°C	-	Maintains consistent performance across wide temperature range

Installation & Maintenance Perspective:

Triangular shape uniquely produces both lateral clamping force and a supplementary vertical component that increases rail-to-sleeper friction .
Generates clamping force by tightening the nut in a controlled degree, unlike purely elastic clips that rely solely on spring deflection .
Asymmetric stress distribution concentrates material along primary load paths, creating optimized stiffness characteristics with approximately 20-30% weight reduction compared to bulkier designs .
Geometric locking feature mechanically interacts with specially designed baseplate shoulders to create a wedging effect under load, enhancing creep resistance .
Achieves 40-60% better longitudinal restraint compared to symmetric clips under identical loading conditions, particularly on gradients exceeding 1.5% .

Maintenance & Operational Perspective

Widely used in railway construction in European and African countries, complying with EN13481-5 standard .
Extensively used on French TGV High-Speed lines, demonstrating proven performance in demanding applications .
Suitable for Tram, LRT, Metro, Main Line, and High Speed tracks .
Widely used in some countries in North Africa on concrete sleepers .
Adaptable to different loads including light rail, passenger traffic, freight traffic, mixed traffic, and heavy haul routes .