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Rail Screw Spike Fastening System
A Railway Screw Spike is a threaded steel fastener engineered for superior holding power in timber sleepers or concrete sleeper inserts, delivering more than twice the withdrawal resistance of conventional dog spikes . Its helical thread form, typically rolled or cut into medium-carbon steel shanks (grades 4.6 to 8.8) , transforms rotational torque into axial clamping force when driven by specialized wrenches or mechanized spikers. The head configuration features square or hexagonal drive surfaces for positive engagement, while various thread profiles, lengths, and diameters accommodate specific geographic and load requirements worldwide .
Technical Specifications:
| Feature Category | Key Benefit | Common Application |
|---|---|---|
| 2x Holding Power | Superior withdrawal resistance vs. dog spikes | Heavy-haul main lines |
| Thread Pitch Options | Optimized for specific sleeper materials | Softwood vs. hardwood sleepers |
| Ferrule Integration | Replaceable inserts extend sleeper life | Concrete sleeper track systems |
| Controlled Torque | Consistent clamping force verification | High-speed passenger corridors |
| Electrical Isolation | Signaling circuit compatibility | Electrified rail networks |
| Grade 4.6-8.8 Steel | Strength matched to load requirements | Turnouts & bridge approaches |
Installation & Maintenance Perspective:
- Helical thread design distributes extraction forces along entire shank length, not just at surface.
- Thread pitch optimized for timber fiber engagement without stripping wood grain.
- Coarse thread variants provide maximum pull-out resistance in softwood sleepers.
- Fine thread options recommended for hardwood or composite sleeper applications.
- Thread run-out transitions smoothly into shank to eliminate stress concentration points.
Maintenance & Operational Perspective
- Pre-drilled pilot holes required in timber to prevent splitting and ensure thread alignment.
- Hydraulic or electric screw spikers deliver controlled torque for consistent embedment depth .
- Square-drive sockets prevent cam-out during high-torque final tightening sequences.
- Installation torque typically ranges from 150-300 Nm depending on sleeper density and spike size.
- Over-torquing risks thread stripping in timber or ferrule damage in concrete inserts.
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