Screw spikes (also known as threaded spikes or sleeper screws) are core anchoring components in railway fastening systems. Typically used in conjunction with pre-embedded plastic dowels, they secure fastening components—such as rail baseplates and tension clamps—onto concrete sleepers. Widely employed in fastening systems like the Type I and Type II tension clamp assemblies, these spikes generate anchoring force through the engagement of their threads. Unlike traditional driven (hammered) hook-head spikes, screw spikes are installed by rotation; they offer stable pull-out resistance and facilitate easier maintenance, disassembly, and adjustment of the track structure.
Common materials for screw spikes include Q235 steel, 45# steel, and 40Cr alloy steel, with the specific material selected based on the line's load requirements. Through processes such as forging, machining, thread forming, and quenching and tempering (heat treatment), the spikes can achieve mechanical strength grades of 4.6, 5.6, or 8.8, meeting the load demands of various railway lines. Surface anti-corrosion treatments—such as black oxide coating, electro-galvanizing, hot-dip galvanizing, Dacromet coating, or sherardizing (zinc diffusion)—are available to ensure durability across diverse operating environments, including dry inland regions, highly corrosive coastal areas, and humid tunnels, thereby extending the product's service life.
These products are extensively used in conventional passenger and freight railways, private industrial/dedicated lines, mining railways, and urban rail transit systems, where they must withstand vertical loads, lateral forces, and the repetitive vibrations generated by passing trains. Before leaving the factory, each product undergoes comprehensive inspection—covering raw materials, thread precision, mechanical properties, and the integrity of the anti-corrosion coating. We offer complete sets of fastening components, providing a one-stop supply solution, and we welcome on-site factory audits and sample testing by our clients.
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