Premium Quality Threaded Road Stud for Reliable Railway Demarcation

• Customization: Available
• After-sales Service: One Year
• Warranty: One Year
• Customized: Railway Tools
• Certification: ISO9001
• Type: Railway Tools
• Transport Package: Export Wooden Box
• Origin: Handan, Hebei Province, China
• Production Capacity: 10000

Product Description

Core function positioning
Rail anchoring function
As mechanical transmission nodes of the track structure, threaded track studs effectively transfer the dynamic load of the train borne by the rails to the sleepers through the mechanical interlocking effect of being screwed into the sleepers. Compared with ordinary road studs, its threaded structure can increase the uplift resistance by 40-60%, making it particularly suitable for heavy-duty lines with an axle load of over 23 tons.
2. Orbital geometry retention
Under the lateral force of the train (especially in small-radius curve sections), threaded track studs can effectively suppress the lateral displacement of the rails relative to the sleepers. The measured data show that in the sections with full-threaded track studs, the lateral displacement of the track can be controlled within 0.5mm, which is significantly better than the 2-3mm of ordinary track studs.
3. Dissipation of vibration energy
The threaded meshing structure has microscopic elastic deformation characteristics and can absorb approximately 15-20% of the wheel-rail impact and vibration energy. In the application scenarios of high-speed railways, when used in combination with elastic pads, the noise in the track sections can be reduced by 3-5dB(A).

Application scenarios
1. Differentiated line adaptation
Heavy-duty freight dedicated line: Reinforced road studs made of alloy steel (such as 35CrMo) with a thread depth of ≥1.5mm should be adopted to ensure that the initial preload force remains above 80% after 300,000 shaft load cycles.
High-speed passenger dedicated lines: It is recommended to use low-stiffness stainless steel track studs (such as 06Cr19Ni10), in combination with torque-controlled installation techniques, to keep the axial preload force deviation within ±5kN.
Urban rail transit: Semi-threaded track studs with a galvanized coating thickness of ≥50μm are mostly selected to balance the installation convenience and anti-corrosion requirements of concrete sleepers.
2. Response to special environments
The section of the cross-sea bridge should be made of 316L stainless steel and pass the 240-hour salt spray test.
In extremely cold regions (-40ºC environment), modified medium carbon steel road studs that have undergone low-temperature impact testing (AKv≥27J) should be selected.
The chemically contaminated area should be equipped with PTFE coating, which is resistant to corrosion by acid and alkali media with pH values ranging from 2 to 12.

Technological innovation direction
1. Intelligent status monitoring
The newly developed embedded track studs are integrated with MEMS sensors, which can monitor the attenuation of preload in real time and wirelessly transmit it to the trackside receiving device via LoRa, achieving a loosening early warning accuracy rate of ≥92%.
2. Upgrading of materials and processes
Laser cladding of WC-Co coating can increase the wear resistance of the threaded part by three times.
The fatigue life of the ultra-fine-grained steel track nails treated by the equal-diameter Angle extrusion (ECAP) process is 2.5 times that of the conventional products.
The bio-based polyurethane coating technology enables the road studs to achieve a 30% weight reduction while maintaining their mechanical properties.
3. Innovation in installation techniques
The hydraulic pulse tightening system, in combination with digital torque management, can increase the installation efficiency to 1,200 pieces per shift, while reducing the pre-tightening force dispersion from ±20% of the traditional method to ±8%.

 

1. Installation stage
Concrete sleepers need to use special taps for prefabricated threads (with a precision of 6H grade).
The installation torque is strictly controlled according to the material classification: carbon steel road studs 120-150N·m, stainless steel road studs 90-110N·m;
Anti-loosening gaskets with pre-set sealant.

2. Operation and Maintenance stage
Establish a preventive replacement system based on the number of axle load passes: For heavy-duty lines, a comprehensive inspection is required for every 80Mt of passing volume;
The root crack of the thread is evaluated by using eddy current testing technology. Develop a prediction model for the health status of road studs and formulate replacement strategies in combination with the assessment of remaining service life.