‌What Are Rail Screw Spikes?‌

Rail screw spikes, also known as ‌sleeper screws‌ or ‌lag bolts‌, are heavy-duty metal fasteners designed to securely attach ‌rail tie plates‌ or ‌rails‌ to ‌wooden sleepers‌ (also called railroad ties). These spikes are typically made from ‌Q235 steel‌, a durable material known for its strength and resistance to corrosion, ensuring long-term stability in railway tracks.

‌Key Features & Applications‌

1. ‌Primary Function‌:

   • Fasten rails to wooden sleepers, preventing movement and maintaining track alignment.
   • Often used with ‌plastic dowels‌ for added stability, especially in regions with high humidity or temperature variations.

2. ‌Common Usage‌:

   • Widely used in ‌North America‌ (USA and Canada) due to their reliability in wooden sleeper systems.
   • Also employed in ‌Africa, South America, and Europe‌, where specific regional standards apply.

3. ‌Design Variations‌:

   • ‌Standard spikes‌: Threaded shafts for easy installation into pre-drilled holes.
   • ‌Big-disk spikes‌: Larger heads for increased surface area, commonly used in Africa and South America.
   • ‌T-type spikes‌: Round-thread design for enhanced grip and vibration resistance.

4. ‌Material & Durability‌:

   • Q235 steel provides high tensile strength (≥700 MPa for some models) and cold-bend resistance (tested up to 90° without cracking).
   • Surface treatments (e.g., galvanization) improve weather resistance.

‌Why Are They Important?‌

• ‌Safety‌: Ensures rails remain firmly attached, reducing risks of derailments.
• ‌Maintenance‌: Extends the lifespan of wooden sleepers by distributing load evenly.
• ‌Versatility‌: Available in multiple sizes (e.g., M20–M26) and lengths (115–215mm) to adapt to different track conditions.

‌Regional Standards & Customization‌

• ‌UIC 864-1‌: Used in Europe for SS series spikes.
• ‌ASTM A66-87‌: Meets US requirements for cold-bend performance.
• ‌NF F 50006‌: French standard for 3V sleeper screws (high tensile strength).
• ‌Custom options‌: Coach screws, double-head spikes, and dive spikes tailored to specific industries (e.g., mining).

‌Production Process‌

1. Raw material (Q235 steel) → 2. Wire drawing → 3. Cutting → 4. Head shaping → 5. Thread rolling → 6. Heat treatment → 7. Surface coating → 8. Quality inspection.

Rail screw spikes are a critical component in railway infrastructure, balancing ‌strength, adaptability, and cost-effectiveness‌ for global rail networks.