Screw Spike for W14 Fastening System

The screw spike for a W14 fastening system is typically an Ss25-160 (or similar designation like Ss35 or DHS35), used in conjunction with a plastic dowel to secure the rail to the concrete sleeper. 

Specifications and Materials

• Designations: Common designations include Ss25-160, Ss35, and DHS35.

• Dimensions: Typical dimensions for these spikes are around M24 x 150mm, M24 x 160mm, or M24 x 161mm.

• Material: They are commonly made from carbon steel grades such as Q235, 35#, or 45#.

• Grade: Available in different property classes, including 4.6, 5.6, and 8.8.

• Surface Treatment: Various options are available depending on the environmental requirements, including plain (oiled), black painting, zinc plating, hot-dip galvanizing, and sherardizing.

• Function: The screw spike works with a plastic dowel (e.g., SDU9 or Sdu25) to fix the tie plate or rail clip (SKL14 tension clamp) to the concrete sleeper, providing high pull-out force and ensuring the rail's stability. 

A Screw Spike for W14 Fastening System is a threaded fastener used to secure rails to concrete ties (sleepers). These screw spikes are specifically designed for use in the W14 rail fastening system, which is commonly used for ballasted track and freight rail systems. The W14 system is known for its robustness and efficiency in maintaining track alignment under heavy traffic conditions.

Properties of Screw Spike for W14 Fastening System

The screw spike for the W14 fastening system is commonly known as the Ss35 screw spike, featuring typical dimensions of M24 × 150mm, M24 × 160mm, or M24 × 180mm. It is typically made from carbon steel with a grade of 4.6, 5.6, or 8.8. 

Performance Requirements

• Clamping Force: When assembled as part of the complete W14 system, it contributes to achieving a nominal clamping force of at least 8kN per tension set, or greater than 18 kN per rail set.

• Pull-out Force: The system (including the plastic dowel) is designed to provide a pull-out force of at least 60kN.

• Cold Bending: The material is expected to pass a 90-degree cold bending test without cracking for grades 4.6 and 5.6.

• Tightening Torque: The performance of the system is dependent on the tightening torque, typically applied between 200 Nm and 250 Nm during installation to achieve the desired clamping force.