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TANAKA DACRO belongs to the EMANAK Group which specializes in metal heat treatment, surface treatment, and plating. 

TANAKA DACRO is a  surface treatment company of metal screws and parts, and specializes in anti-rust and other performance enhancement. Its product "Z Coat" has the following feature. Most plating operations adopt "liquid plating" which uses liquid coating for surface treatment. "Z Coat" is the opposite way, adopting "dry plating" that does not use liquid coating. There is no need to worry about hydrogen embrittlement or reduced stress driven by high temperature. In addition, "Z Coat" ensures high and persistent anti-rust effect for difficult-to-plate high strength bolts.