↵Rail Screw Spike Fastening System
A Railway Screw Spike is a threaded fastener, combining the functions of a bolt and a spike, designed to secure rail baseplates to wooden, composite, or concrete sleepers through mechanical threading and tension.
It consists of a steel shaft with machine-cut threads along its upper portion and a coarse, wood-gripping thread or helical flange at its lower end for embedding into the sleeper material.
Installation requires it to be screwed into a pre-drilled or pre-formed hole in the sleeper using manual wrenches or powered torque-controlled drivers, creating a secure, tensioned connection.
Technical Specifications:
| Type / Designation | Governing Standard / Region | Typical Length | Thread Description | Primary Application Context |
|---|---|---|---|---|
| AREMA Screw Lag Spike | AREMA, North America | 6.5 in (165 mm) | Coarse wood thread (full length or lower) | Mainline curves & gradients on wood ties |
| UIC 864 Screw Spike | UIC, Europe | 160 mm | Machine thread (upper), wood thread (lower) | European mainlines with wooden sleepers |
| Hook Head Screw Spike | Various (e.g., British Legacy) | 7 in (178 mm) | Coarse wood thread | Direct rail fastening on bridge timbers |
| Composite Sleeper Screw Spike | Manufacturer Specifications | 140 mm | Special coarse "rake" thread | Glass-fiber or plastic composite sleepers |
| Heavy-Duty Turnout Spike | AREMA / Proprietary | 8 in (203 mm) | Extra-coarse deep-thread | Switch blades & crossing noses |
Functional & Engineering Perspective
Wooden sleeper tracks on steep gradients and sharp curves, where its superior pull-out resistance is crucial to counteract longitudinal forces from braking and lateral forces from centrifugal action.
Bridge timbers and decking where vibration is high and a secure, non-loosening connection is paramount for structural integrity and safety.
Joints, turnouts (switches), and crossings (special trackwork), providing a rigid and stable fastening point in complex rail geometries under high impact loads.
Maintenance & Operational Perspective
- Periodic torque audits are scheduled every 2-4 years using calibrated torque wrenches to verify pre-tension has not been lost due to vibration or wood compression.
- Corrective maintenance involves re-tightening loose spikes; if threads in the sleeper are stripped, the hole must be re-drilled and a larger diameter "plug spike" or resin anchor used.
- Replacement cycles are long, often 20-40 years, and are typically tied to the degradation of the sleeper itself rather than failure of the steel spike.
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