Rail Screw Spike Fastening System
The Railway Screw Spike is a helically-threaded, high-strength fastener characterized by its forged head and coarse-pitch spiral shank, engineered to create a removable, mechanical interlock between rail components and supporting sleepers through rotational insertion rather than impact driving . Unlike the friction-dependent dog spike that relies on wood fiber compression, the screw spike generates holding power through positive thread engagement with the base material-whether timber fibers or pre-installed concrete inserts-delivering documented pull-out resistance values of 3,000-6,000 pounds depending on substrate conditions and installation quality .
Technical Specifications:
| Parameter | Screw Spike (Timber) | Screw Spike (Concrete Insert) | Dog Spike | Elastic Clip System |
|---|---|---|---|---|
| Installation Torque | 150-300 Nm | 100-250 Nm | N/A (impact) | N/A (press-in) |
| Pull-Out Resistance | 3,000-5,000 lb | 2,500-4,500 lb | 2,000-4,000 lb | N/A |
| Lateral Resistance | 1,500-2,500 lb | 2,000-3,000 lb | 2,000-4,000 lb | 5-25 kN clamping |
| Sleeper Damage Risk | Low (thread cutting) | None (insert protected) | Moderate (splitting) | None |
| Installation Speed | 30-60 seconds | 20-40 seconds | 5-10 seconds | 10-30 seconds |
| Removal Time | 20-40 seconds | 15-30 seconds | 30-60 seconds | 10-20 seconds |
| Reusability Cycles | 3-5 times | 10-20 times | 1-2 times | 50+ times |
Installation & Maintenance Perspective:
- Square Head Design: The traditional four-sided head (25-30 mm across flats) provides positive engagement with manual or powered socket tools, with sharp corners resisting cam-out under high torque application .
- Hexagonal Head Variant: Six-sided configuration enables higher torque transmission (typically 20-30% greater than square heads) and accommodates standard railway socket wrenches without specialized tooling .
- Double-Head Configuration: The distinctive "double-head" design features both a driving square and a lower hexagonal section, allowing installation from either orientation and providing backup engagement if upper head corners become worn .
Maintenance & Operational Perspective
- Timber-Optimized Thread: Deep, widely-spaced threads (6-8 mm pitch) with sharp crests cut into wood fibers rather than crushing them, maximizing mechanical engagement while minimizing timber splitting .
- Concrete Insert Thread: Shallower, finer threads (4-5 mm pitch) designed to engage with plastic or metal female inserts pre-cast in concrete sleepers, providing durable thread engagement over multiple installation cycles .
- Tapered Root Diameter: Progressive increase in root diameter from tip to head creates a wedging action during final installation turns, pre-loading the surrounding material for enhanced vibration resistance .
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