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Railway sleeper screws, also known as screw spikes or coach screws, are vital fasteners that secure rails to concrete sleepers, typically used in combination with pre-inserted plastic dowels to ensure track stability and safety.
Usage and Function
Usage and Function
Anchoring: In concrete sleepers, the screw is inserted into a plastic dowel (sleeve) that is embedded in the concrete, providing a secure, threaded anchor point.
System Integration: These screws are part of a complete fastening system (e.g., Vossloh W system, KPO system), working alongside tension clamps, guide plates, and rail pads to manage the immense forces and vibrations from passing trains.
Stability: The threaded design and material strength provide high pull-out resistance, preventing track misalignment and ensuring a reliable grip even under heavy loads and constant vibration.
Materials and Specifications
Materials and Specifications
Sleeper screws are manufactured to meet stringent international standards, such as UIC864-1, AREMA, DIN, and GB.
Material: They are typically made from high-strength carbon or alloy steel, with common grades including Q235, 35#, and 45#. For corrosive environments, stainless steel may be used.
Strength Grades: Available in various strength ratings, such as 4.6, 5.6, and 8.8, to suit different track and load requirements.
Head Type: The head is commonly a square or hexagonal shape to facilitate easy application of torque during installation and maintenance.
Corrosion Protection: To extend lifespan, various surface treatments are applied, including:Hot-dip galvanization (HDG)；Zinc plating；Dacromet coating；Black oxide finish
Common Types and Dimensions
Common Types and Dimensions
Different types are available based on specific requirements, often identified by series designations.
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