↵Rail Screw Spike Fastening System
The screw spike is also known as rail screw. As one kind of Rail spike, it is a metal screw for fixing rail fasteners. Screw spike is usually made of NO.3 steel. Because its nail rod surface has thread, so it is called screw spike. The pull-out resistance is 0.5 ~ 1.0 times larger than that of common rail spike, but the thrust resistance is 50% less. Due to disassembly and assembly inconvenience, it is difficult to adjust the rail gauge, which is generally used on the railway turnout.For meeting various needs of clients, we can offer coach screws, stud screw, railway sleeper screws and other coustom screw spike in railway.
Technical Specifications:
| Feature | Category | Specific Detail / Characteristic | |
|---|---|---|---|
| Fastening Principle | Mechanical | Threaded Mechanical Interlock & Friction | |
| Primary Installation Tool | Installation | Impact Wrench or Torque Wrench (after pre-drilling) | |
| Key Functional Advantage | Mechanical | Adjustable, High-Tension Clamping & Resistance to Vibration Loosening | |
| Typical Modern Application | Economic/Application | Turnouts & Crossings, Bridge Ties, Heavy-Haul Specific Sections | |
| Sleeper Compatibility | Functional | Primarily Timber; Special versions for Concrete | |
Mechanical & Installation Perspective
High-Tension Threaded Engagement: The coarse, deep-cut threads create significant surface area contact with the sleeper material, generating high pull-out resistance through combined friction and mechanical interlock.
Adjustable Clamping Force: Allows for controlled pre-tensioning during installation via applied torque, enabling a specific and consistent clamping force to be applied to the rail baseplate, which can be verified with a torque wrench.
Rigid, Non-Elastic Restraint: Provides zero elastic give under load, which transfers dynamic forces more directly into the sleeper but can be advantageous for applications requiring absolute fixity, such as at check rails or in turnouts.
Installation, Maintenance & System Integration Perspective
- Precision Drilling Requirement: Installation mandates accurate pre-drilling of pilot holes in the sleeper to prevent wood splitting (in timber) or micro-cracking (in concrete), requiring additional equipment and setup time.
- Torque-Dependent Installation: Requires calibrated manual or powered wrenches for proper installation, where applied torque directly correlates to the clamping force and long-term holding power.
- Re-tightening and Re-torquing: May require periodic re-torquing after initial settlement or seasonal wood movement (in timber sleepers) to restore design tension, though far less frequently than dog spikes.
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