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By certification 
High tensile screw spike are what we called heat treated screw spike with a min tensile strength of 120000psi, yield strength 92000psi and elongation 14%. This high tensile screw spike is produced according to ASTM A66-87 standard and wax coated on the threaded part.
Shanghai Bosheng Industries is specialized in the supplying of rails, turnouts and various rail fastening materials such as rail fishplate, tie plate, rail clips, screw spikes, rail anchors, rail shoulder, rail pads and so on.
