Description
Technical Parameters
Railway Screw Spikes
| Feature | Description |
|---|---|
| Primary Function | To provide a high-strength, vibration-resistant connection between the rail/baseplate and the sleeper (wood or concrete). |
| Common Coatings | Galvanization (zinc coating), Geomet® (a thin, lubricating coating), Black (uncoated). |
| Advantages | Superior holding power and resistance to loosening from vibration; can be removed and re-tightened without significant loss of grip; suitable for both wood and concrete sleepers. |
| Disadvantages | Higher cost than dog spikes; slower installation time; requires more precise drilling (in wood) or specialized sleeper inserts (in concrete). |
Detailed Specifications & Types Table
This table breaks down the common types of screw spikes based on their application.
| Spike Type / Application | Thread Description | Typical Dimensions | Sleeper Type & Application Notes |
|---|---|---|---|
| Lag Screw Spike (for Wood) | Coarse, deep, wood-cutting thread (similar to a large lag bolt). | Common sizes: e.g., 3/4" x 6", 1" x 7" (Diameter x Length). | Wooden Sleepers. Used in critical areas like curves, bridges, grade crossings, and heavy-haul lines where maximum grip is essential. A lead hole is typically drilled to prevent the wood from splitting. |
| Screw Spike (for Concrete) | Machine-style thread, often with a unique profile (e.g., "B" thread). | Varies widely. Defined by thread diameter (e.g., M24) and length. | Concrete Sleepers. The screw threads into a pre-embedded, plastic or metal insert within the concrete. This is a common fastening system for concrete sleepers globally. |
| Self-Tapping Screw Spike | A cutting tip and thread designed to tap its own hole. | Similar to lag screws. | Wooden Sleepers. Eliminates the need for a separate drilling operation, speeding up installation. Gaining popularity for mechanized track renewal. |
Comparison with Dog Spikes
| Parameter | Dog Spike | Screw Spike |
|---|---|---|
| Holding Power | Moderate. Relies on the crushing of wood fibers. Can loosen over time. | Very High. Relies on mechanical interlocking of threads. Maintains clamp load. |
| Installation Speed | Very Fast. Driven with a few hammer blows. | Slower. Requires drilling (for wood) and a slower screwing-in process. |
| Cost | Low. Cheaper to manufacture. | Higher. More material, complex manufacturing, and higher installation cost. |
| Re-usability | Poor. Once pulled, the hole is often enlarged, requiring a new location or a plug. | Good. Can often be unscrewed and re-tightened in the same hole without significant strength loss. |
| Primary Application | Standard track on wood sleepers with low to moderate traffic. | Critical sections (curves, bridges), heavy-haul lines, and concrete sleeper applications. |
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