Description
Technical Parameters
Railway Screw Spikes: Technical Data Sheet
| Aspect | Description & Details |
|---|---|
| Product Name | Screw Spike (Also known as Coach Screw or Lag Bolt Spike) |
| Primary Function | To securely fasten rails, baseplates, or track components to wooden sleepers (ties), providing a stronger and more reliable hold than dog spikes. |
| Key Features | - Threaded Grip: Provides a superior holding power through mechanical engagement with the wood fibres. - Resists Loosening: Less prone to working loose under vibration compared to dog spikes. - Reusable: Can often be removed and re-tightened without significant loss of holding power. - Corrosion Resistant: Typically galvanized or otherwise coated. |
| Main Applications | - Wooden Sleepers: Primary application for securing baseplates to sleepers. - Baseplate Fixation: Used to attach steel baseplates to wooden sleepers, to which the rail is then fastened with a separate system (e.g., clips). - Critical Sections: Points and crossings, bridges, and areas requiring extra security. - Heritage Railways: Used for its historical authenticity and improved performance over dog spikes. |
Comparison with Dog Spikes
| Feature | Screw Spike | Dog Spike |
|---|---|---|
| Fastening Principle | Mechanical Thread Grip: Threads engage the wood fibres. | Friction Grip: Relies on friction between spike and wood. |
| Holding Power | Excellent: Superior resistance to pull-out and loosening. | Poor: Prone to working loose under vibration. |
| Installation | Rotational: Requires turning with a wrench or power tool. Requires a pilot hole. | Impact: Driven with a hammer or spike maul. |
| Maintenance | Low: Stays tight for longer periods. | High: Requires frequent re-driving. |
| Sleeper Damage | Low: Threads displace wood rather than splitting it. | High: Splits and damages wood over time. |
Advantages & Disadvantages
| Advantages | Disadvantages |
|---|---|
| ✅ Superior Holding Power: Provides a much more secure connection to the sleeper. | ❌ Higher Cost: More expensive to manufacture than a dog spike. |
| ✅ Reduced Maintenance: Stays tight longer, lowering life-cycle costs. | ❌ Slower Installation: Requires drilling a pilot hole and wrenching, which is slower than driving a spike. |
| ✅ Less Sleeper Damage: Threads minimise splitting, extending sleeper life. | ❌ Special Tools Required: Requires a drill for the pilot hole and a wrench or powered driver for installation. |
| ✅ Improved Gauge Holding: Helps maintain track geometry better than dog spikes. | ❌ Application Specific: Primarily only for woo |
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