Description
Technical Parameters
Railway Screw Spikes
| Category | Parameter | Description / Specification | Notes / Purpose |
|---|---|---|---|
| General Information | Product Name | Screw Spike | Also known as Lag Screw Spike or Coach Screw. |
| Primary Function | To fasten flat-bottomed rail to wooden sleepers (ties). | Provides a superior hold compared to dog spikes. | |
| Application | Railways with wooden sleepers requiring higher stability. | Common in curves, heavy-haul sections, and where track stability is critical. | |
| Physical Dimensions | Total Length (L) | 152 mm (6"), 165 mm (6.5"), 178 mm (7") | Longer than dog spikes for deeper engagement. |
| Thread Length (L_thread) | ~50% to 70% of total length. | Designed to engage deeply into the wooden tie. | |
| Shank Diameter (D) | ~19 mm (3/4"), 22 mm (7/8"), 25 mm (1") | Larger diameter than dog spikes for greater strength. | |
| Head Type | Square Head or Hex Head. | Designed to be driven with a wrench or power tool. | |
| Thread Type | Coarse, deep, wood-cutting thread. | Allows it to cut its own thread into the wood for a tight grip. | |
| Material & Finish | Material Grade | Medium Carbon Steel (e.g., AISI 1035, 1045). | Heat-treated for high strength and toughness. |
| Surface Treatment | Hot-Dip Galvanizing (HDG). | Essential for corrosion resistance in outdoor environments. |
Key Terminology & Notes:
- Superior Performance: The primary advantage of screw spikes over dog spikes is their vastly superior resistance to loosening under vibration. The screw thread creates a continuous biting force that holds the gauge much more effectively, especially on curves and in high-stress areas.
- Installation Complexity: Installation is more complex and expensive than driving dog spikes. It requires a two-step process: 1. Drilling a pilot hole. 2. Driving the spike with high torque. This makes them more costly initially but reduces long-term maintenance.
- Common Use Cases:
- Curves: Where lateral forces are high.
- Heavy-Haul Lines: For increased track stability under heavy axle loads.
- Bridge Decks: Where track geometry is critical.
- Grade Crossings: For added stability.
- Comparison to Dog Spikes:
- Pros: Better holding power, less maintenance, more stable gauge.
- Cons: Higher initial cost, slower installation, requires drilling.
- Not for Concrete: Screw spikes are exclusively for wooden ties. They are not used with concrete sleepers, which require a completely different fastening system (e.g., elastic clips with inserted shoulders).
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