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Rail Screw Spike Fastening System
The Railway Screw Spike is a precision-engineered threaded fastener manufactured from quenched and tempered alloy steel, featuring a continuous helical thread profile, a tapered or blunt starting point, and a forged drive head configured for high-torque rotational installation into timber, composite, or engineered wood sleepers. Unlike traditional drive spikes that depend on displacement-induced friction, this fastener develops holding capacity through positive mechanical engagement between the thread flanks and the substrate material, enabling precise preload control through torque application while allowing non-destructive removal for track maintenance and adjustment.
Technical Specifications:
| Parameter | Specification | Performance Characteristic |
|---|---|---|
| Material Treatment | Quenched and tempered | 120 – 150 ksi tensile strength |
| Thread Series | Coarse, UNC or equivalent | 5–8 threads per inch typical |
| Embedment Depth | Below tie plate | 4–6 inches (100–150 mm) |
| Installation Method | Rotary impact or manual torque | 150–350 Nm installation torque |
| Withdrawal Capacity | Ultimate pull-out | 12–20 kN in sound hardwood |
Installation & Maintenance Perspective:
- Coarse Thread Series: A reduced thread count per inch maximizes material engagement in lower-density substrates such as preservative-treated timber, providing optimal holding capacity without compromising installation speed.
- Deep Thread Profile: Extended thread depth increases the shear area between fastener and substrate, distributing withdrawal loads across a larger material volume to prevent localized failure.
- Self-Tapping Point: The tapered starting threads incorporate cutting or forming features that initiate thread engagement without requiring precise pilot hole alignment, accommodating field installation variations.
Maintenance & Operational Perspective
- Impact-Ready Head: The drive head geometry is reinforced to withstand high-torque impact tools used in mechanized installation, preventing head deformation or drive failure during production-scale fastening operations.
- Multiple Drive Options: Head configurations including square, hexagonal, and round with drive slot provide compatibility with manual, powered, and fully automated installation systems across different application scales.
- Torque Limiting Compatibility: The drive head is dimensioned for use with torque-limiting tools that prevent over-tightening, ensuring consistent preload without risk of substrate damage or fastener yield.
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