Description
Technical Parameters
Railway Screw Spikes Technical Specifications & Design
| Category | Specification | Details / Value |
|---|---|---|
| Product Name | Railway Screw Spike (Lag Screw Spike) | |
| Head Design | Type | Hexagonal Head (Hex Head) or Square Head. |
| Purpose | Allows for the application of high torque during installation using standard wrenches or sockets. | |
| Shank & Threading | Thread Type | Coarse, deep, sharp-threaded wood screw profile (e.g., based on ANSI/ASME B18.2.1). |
| Threading Length | Typically fully threaded to maximize grip length within the sleeper. | |
| Point | Gimlet point for self-tapping and easier starting, reducing the need for precise pilot holes. | |
| Material & Finish | Material Grade | Medium Carbon Steel (e.g., C1045, Grade 5 equivalent) for optimal strength and toughness. |
| Corrosion Protection | Hot-Dip Galvanized (HDG) to ASTM A153, Class B or C, providing a thick, durable coating. |
Performance, Application & Comparative Advantages
| Category | Specification | Details / Value |
|---|---|---|
| Holding Performance | Primary Advantage | Exceptional resistance to vibrational loosening due to the threaded connection, far superior to driven dog spikes. |
| Clamping Force | Generates a high, consistent preload that maintains rail restraint. | |
| Fatigue Life | Excellent performance under dynamic loading cycles due to the secure mechanical lock. | |
| Application Scenarios | Ideal Use Cases | • Curves & High-Stress Sections: Essential for resisting lateral forces. • Bridge Decks & Tunnels: Where track stability is paramount. • Grade Crossings (Turnouts/Diamonds): Withstands impact loads. • Heavy-Haul Lines: For maintained gauge integrity. |
| Sleeper Compatibility | Hardwood Sleepers (Oak, Jarrah), Softwood Sleepers (Pine, treated), and some Composite Sleepers. | |
| Advantages over Dog Spikes | Loosening Resistance | Dramatically superior. The threaded design prevents the gradual backing out common with dog spikes. |
| Grip Strength | Higher pull-out strength and resistance to rail rotation. | |
| Reusability | Can be unscrewed and re-used to a limited extent, unlike a bent or damaged dog spike. |
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