Name: China Fixing Crane Rail Clip SKL Clip Manufacturers Suppliers Factory - Gnee Steel
Brand: GNEE
SKU: 296827802

Fixing Crane Rail Clip SKL Clip

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 skl Clip Fastening System

The Railway SKL Clip is a precision-forged, high-tensile spring steel tension clamp that forms the elastic core of the Vossloh-type rail fastening system, characterized by its distinctive omega-shaped (ω) geometry with two symmetrical arms and a central elevated loop. This component operates by being driven or screwed into engagement over angled guide plates, where its elastic deflection generates a sustained and calibrated toe load onto the rail foot, typically ranging from 7 to 25 kN depending on the variant

Technical Specifications:

Parameter	SKL-1 / SKL-3	SKL-12 / SKL-14	SKL-15 / SKL-B15	W-Type (Nabla)	E-Type Clip
Typical Bar Diameter	13-15 mm	14-16 mm	15-20 mm	13-23 mm (strip)	13-23 mm (strip)
Clamping Force Range	8-12 kN	12-18 kN	15-25 kN	8-15 kN	8-13 kN
Primary Application	Conventional ballasted track	Heavy haul & freight	High-speed (≤350 km/h)	Mixed traffic	Light rail & secondary lines
Installation Method	Screw-driven over guide plates	Screw-driven over guide plates	Screw-driven over guide plates	Hammer-driven	Hand pliers
Fatigue Life (cycles)	3+ million	3+ million	5+ million	3+ million	5+ million
Material Grade	60Si2Mn / 55Si7	60Si2CrA / 38Si7	60Si2CrA / 38Si7	55Si7	60Si2Mn

Installation & Maintenance Perspective:

Controlled Alloy Chemistry: The clip is manufactured from silico-manganese spring steel grades such as 60Si2Mn, 55Si7, or 38Si7, with precise carbon content (0.35-0.60%) and silicon additions (1.5-2.0%) that enhance elastic limit and fatigue resistance through solid solution strengthening .
Quenched and Tempered Microstructure: Following hot forging, the clips undergo austenitization, oil quenching, and tempering to achieve a uniform tempered martensite structure with a hardness range of HRC 42-47, providing the optimal balance between spring flexibility and resistance to permanent set .
Decarburization Control Protocols: Strict manufacturing controls prevent surface decarburization during heat treatment, as a carbon-depleted surface layer would reduce fatigue life by creating soft zones susceptible to crack initiation under cyclic loading .

Maintenance & Operational Perspective

Guide Plate Interface Mechanics: The clip's arms bear against angled guide plates that convert the vertical screw-down force into horizontal clamping pressure, while also transferring lateral loads from the rail to the sleeper through friction and mechanical interlock .
Overload Protection Geometry: The central loop of the clip is deliberately designed with a clearance gap above the rail foot; under extreme vertical loads, this loop contacts the rail surface, preventing overstretching and plastic deformation of the clip arms .
Clamping Force Variability: By adjusting the installation torque of the screw within specified limits (typically 150-250 Nm), the effective toe load can be modulated to suit specific track requirements, such as increased longitudinal restraint on steep gradients or reduced clamping in noise-sensitive areas .