CNS 4320-1987 Hexagon Head Bolts Finished and Semi-Finished Metric Fine Thread《六角头螺栓（精制及半精制，公制细螺纹）》.pdf

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CNS 4321-1987 Hexagon Bolts with Approximately to Head Finished and Semi-Finished Metric Fine Thread《六角头全螺纹螺栓（精制及半精制，公制细螺纹）》.pdf

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