Rail Dog Spike Fastening System
The Railway Dog Spike is a traditional, wedge-shaped track fastener characterized by its offset "dog-head" profile and square-section shank terminating in a chisel point, designed exclusively for securing flat-bottomed rails to wooden sleepers (ties) . Unlike modern elastic fasteners that incorporate spring elements for calibrated clamping, the dog spike operates through rigid friction-based engagement-it is driven through pre-drilled holes in the rail base or tie plate directly into the timber substrate, where the compression of wood fibers around its square shank generates holding power against rail movement .
Technical Specifications:
| Parameter | Dog Spike | Screw Spike (Coach Screw) | Elastic Rail Clip (e.g., E-Clip) | Spring Spike |
|---|---|---|---|---|
| Fastening Principle | Rigid friction (wood fiber grip) | Threaded mechanical interlock | Elastic spring deflection | Elastic deformation |
| Primary Sleeper Type | Wooden only | Wooden or concrete (with inserts) | Concrete, steel, composite | Wooden |
| Installation Method | Hammer driving (manual/pneumatic) | Screw driving (torque-controlled) | Press-in or hammer-in | Hammer driving |
| Pull-Out Resistance | Moderate (grain-dependent) | High (0.5-1.0× higher than dog) | N/A (not pull-out based) | Higher than common spike |
| Thrust Resistance | Good (group action) | ~50% less than dog spike | High (calibrated) | Higher than common spike |
Installation & Maintenance Perspective:
- Offset Head Design: The distinctive L-shaped head features a sloped underside that matches the rail foot angle, hooking over the flange to resist vertical uplift while presenting a striking surface for driving tools .
- Square Shank Principle: The square cross-section (typically 14-16mm) prevents rotation within the timber hole and provides approximately 50% greater holding power than a circular shank of equivalent cross-sectional area .
- Chisel Point Termination: The wedge-shaped tip parts wood fibers rather than cutting them, minimizing splitting while creating maximum fiber compression along the grain direction for enhanced grip .
Maintenance & Operational Perspective
- Carbon Steel Grades: Manufactured from medium-carbon steels such as Q235, 45#, or 55#, with carbon content typically 0.17-0.25% providing optimal balance between driving malleability and in-service strength .
- Mechanical Property Specifications: AREMA-compliant spikes demonstrate minimum tensile strength of 70,000 psi, yield point of 46,000 psi, and 25% elongation, ensuring ductility sufficient to withstand driving without fracture .
- Corrosion Protection Options: Available surface treatments include plain (oiled), black oxide, black paint, hot-dip galvanizing (HDG), and geometric zinc coatings selected based on environmental exposure conditions .
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