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Rail Dog Spike Fastening System
A Railway Dog Spike is a one-piece, L-headed steel fastener driven through the rail base or tie plate directly into wooden sleepers to secure the track position . Distinguished by its offset head with a sloped underside matching the rail foot angle and its square-shanked, wedge-pointed geometry, it creates a rigid, friction-based connection . Unlike elastic fastening systems, the dog spike relies entirely on wood fiber compression for holding power, offering no spring action but providing a simple, replaceable anchorage for low-speed and industrial track applications .
Technical Specifications:
| Feature Category | Key Benefit | Common Application |
|---|---|---|
| Cold Bend Capacity | 120° bend without cracking ensures ductility | Heavy-axle-load industrial tracks |
| Dimensional Precision | ±1/32" tolerances guarantee consistent fit | Interchangeable field replacement |
| Wood Grain Orientation | Wedge across grain maximizes fiber grip | Timber sleeper preservation |
| Historical Provenance | 1864-1888 examples still recoverable | Heritage railway restoration |
| Grade Versatility | 4.6 to 12.9 tensile strength options | Matching specific load requirements |
| Simple Removal | Lugged head design enables extraction | Maintenance cycles & sleeper replacement |
Installation & Maintenance Perspective:
- Manufactured from low to medium carbon steels including Q235, 45#, and 55# with tensile strength options from 4.6 to 12.9 grade .
- Must withstand cold bending through 120 degrees around a pin without cracking on the outside of the bent portion .
- Head must endure bending backward to 55 degrees with the face line without fracture, proving ductility .
- Surface treatments include plain oil coating, black paint, zinc plating, or hot-dip galvanizing for corrosion resistance .
Maintenance & Operational Perspective
- Driven vertically through tie plate apertures into pre-drilled pilot holes using spike mauls or pneumatic drivers .
- The wedge-shaped point is oriented across the wood grain (parallel to track) to maximize fiber grip and prevent splitting .
- Installation requires matching spike length (e.g., 5/8"×6", 9/16"×5-1/2") to sleeper thickness for optimal holding force .
- Regular inspection essential as vibration and wood compression cause gradual loosening requiring re-driving .
Gnee Professional supplier
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