Description
Technical Parameters
Product Overview & Features of Railway Screw Spikes
| Item | Description |
|---|---|
| Product Name | Railway Screw Spike |
| Alternative Names | Screw Stud, Concrete Sleeper Screw |
| Application | Fastening rails to concrete sleepers (ties) in ballasted track systems. Commonly used with an elastic rail clip (e.g., SKL, Nabla). |
| Core Function | To be pre-embedded or drilled into the concrete sleeper, providing a strong, threaded anchor point for the fastening assembly. |
| Material | High-Quality Carbon Steel (e.g., Q235, 45#) or Alloy Steel. |
| Surface Treatment | Geomet Coating (Dacromet), Hot-Dip Galvanizing, or Electro-galvanizing. Provides high corrosion resistance and prevents seizing in the concrete. |
| Key Features | • High tensile and shear strength • Excellent corrosion resistance • Prevents rotation during clip installation • Reliable and maintenance-free |
| Common Standards | ISO, EN, GB/T or specific railway authority standards (e.g., UIC). |
Detailed Technical Parameters of Screw Spikes
| Parameter | Specification / Value | Remarks / Standard |
|---|---|---|
| Common Thread Types | M24, M22, M20 (Metric Thread) | M24 is a very common size. The thread is typically coarse-pitched. |
| Common Lengths | 150 mm, 180 mm, 200 mm | Length is chosen based on sleeper design and required embedment depth. |
| Tensile Strength | ≥ 500 MPa | Ensures the spike can withstand the vertical pull-out forces. |
| Proof Load | Typically 40-60 kN (for M24) | The load the spike must withstand without permanent deformation. |
| Torque Resistance | High | The square or ribbed head is designed to resist turning during clip installation. |
| Head Types | Square Head, Ribbed Head, Double-D | Allows for installation using a wrench or specialized socket. Prevents rotation within the concrete. |
| Installation Method | Epoxy Resin Grouting or Direct Drilling into pre-formed holes in the concrete sleeper. | |
| Weight (per piece) | Approx. 0.8 - 1.2 kg (for M24x180mm) | Varies with diameter an |
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