Description
Technical Parameters
Rail Screw Spike - Technical Specification & Identification
| Parameter | Description & Details |
|---|---|
| Product Name | Screw Spike (or Coach Screw) |
| Common Names | Screw Spike, Lag Screw Spike, Bolt Spike |
| Primary Function | To secure flat-bottomed rail to timber sleepers (ties), offering superior holding power and resistance to loosening compared to dog spikes. |
| Application | Primarily for use with Timber Sleepers (Wooden Ties) and Flat-Bottom Rail. |
| Standard Material | Medium-Carbon Steel (e.g., AISI 1035, 1040) or Boron Steel for high strength. |
| Material Standard | ASTM: A183 (Standard Specification for Carbon Steel Track Bolts and Nuts). Often manufactured to meet AREMA guidelines. |
| Heat Treatment | May be heat-treated (quenched and tempered) to achieve higher strength grades. |
Dog Spike vs. Screw Spike
| Feature | Dog Spike | Screw Spike |
|---|---|---|
| Holding Mechanism | Friction & Shear | Mechanical Interlock (Threads) |
| Holding Power | Moderate | High |
| Installation | Hammered (Impact) | Wrenched (Torque) |
| Sleeper Damage | Higher (Splitting) | Lower (Threads cut cleanly) |
| Cost | Lower | Higher |
| Best For | Straight, low-speed track | Curves, grades, high-stress areas |
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