↵Rail Screw Spike Fastening System
The Railway Screw Spike is a threaded mechanical fastener that provides a secure, adjustable connection between the rail and wooden sleeper. Featuring a large, square or hexagonal head, a threaded shank, and a sharp gimlet point, it is screwed-not driven-into a pre-drilled pilot hole in the timber. The head is designed to clamp the rail foot firmly against the sleeper, often with an intermediary steel tie plate.
Technical Specifications:
| Feature | Utility Perspective | Production Perspective | Maintenance Perspective | |
|---|---|---|---|---|
| Core Principle | Adjustable, torque-based clamping via threaded engagement | Precision forming of threads and forging of drive features | Management of preload through torque measurement and correction | |
| Key Metric | Installed torque / Clamping force | Thread form accuracy and tensile/shear strength | Retention of specified installation torque | |
| Critical Interface | Spike thread-to-timber & spike head-to-tie plate/rail | Tooling integrity in thread rolling dies | Integrity of the threaded hole in the sleeper | |
| Success Indicator | Maintained rail alignment and absence of plate cutting | Consistent thread engagement strength and corrosion resistance | Low incidence of loose spikes and preserved sleeper thread health | |
| Tool/Technique | Spike wrench or impact gun for installation, torque wrench for check | Thread rolling machines, forging presses, coating baths | Torque wrench, spike extractor, thread repair kits |
Functional & Engineering Perspective
Torque-Dependent Clamping: Provides a measurable and adjustable clamping force based on installation torque, ensuring uniform and predictable rail restraint.
Superior Anti-Loosening Performance: The threaded engagement with the timber offers greater resistance to working loose under vibration compared to smooth-shank dog spikes.
Enhanced Lateral Stability: The combination of a screw spike and a steel tie plate significantly increases lateral restraint of the rail, improving track alignment stability, especially on curves.
Maintenance & Operational Perspective
- Head and Point Forging: The wrenching head (square or hex) and the self-tapping gimlet point are typically hot-forged for strength and durability.
- Material and Strength Grades: Manufactured from medium to high-carbon steel, often heat-treated to achieve specific tensile and shear strength grades suitable for timber fastening.
- Corrosion Protection Coatings: Typically receive a robust protective coating such as hot-dip galvanizing to withstand moisture and chemical exposure from treated sleepers.
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