Railway SKL Type Fastening System

Railway SKL Type Fastening System

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

Railway SKL Clips

Parameter SKL 12 (Standard Passenger/Freight) SKL 14 (Heavy-Haul Railway) SKL 15 (High-Speed Railway) SKL 10 (Urban Rail Transit)
Model/Type SKL 12 SKL 14 SKL 15 SKL 10
Applicable Rail Section UIC 54 (43kg/m), UIC 60 (60kg/m) UIC 60 (60kg/m), 75kg/m Heavy-Haul Rail UIC 60 (60kg/m), CRH High-Speed Rail (60kg/m) Light Rail (30kg/m), Tram Rail (22kg/m)
Matching Rail Pad 10mm Thick Rubber/Polymer Pad 12mm Thick Wear-Resistant Pad 15mm Thick High-Elasticity Pad 8mm Thick Vibration-Damping Pad
Material 60Si2MnA Spring Steel 55SiMnVB Alloy Spring Steel 60Si2CrVA High-Strength Spring Steel 50CrVA Spring Steel
Heat Treatment Quenching + Tempering (420-460℃) Quenching + Tempering (430-470℃) Quenching + Tempering (440-480℃) Quenching + Tempering (410-450℃)
Hardness (Rockwell) HRC 43-48 HRC 45-50 HRC 46-52 HRC 41-46
Tensile Strength ≥1370MPa ≥1570MPa ≥1765MPa ≥1275MPa
Yield Strength ≥1275MPa ≥1470MPa ≥1665MPa ≥1175MPa

Railway SKL Type Fastening System

Comparison with Other Clips (e.g., E-Clip, Nabla Clip)

Feature SKL Clip Pandrol® 'e' Clip Nabla Clip
Installation Tensioned and locked into place with a bolt/nut. Pressed down ("nipped") onto a shoulder. Hammered or pressed into a housing.
Tool Manual or hydraulic wrench for the bolt. Special hydraulic "nipping" tool. Manual hammer or press.
Visual ID Distinctive shape, secured by a bolt on one side. Classic "E" shape. Inverted "V" or "nabla" (∇) shape.
Key Advantage Very secure, resistant to loosening, high toe load. Simplicity, widespread use, easy installation. Simple design, no small parts, good fatigue life.

 

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Railway SKL Type Fastening System

Railway SKL Type Fastening System

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