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Ningbo Yinzhou Yongxin Standard Components Co.,Ltd professionally produces standard pieces.we mainly produce the standard of national(GB),German(DIN).Japan(JIS),America(ANSI/ASTM),English(BS)fastener,auto fitings, electrical fittings, bulldozer screw.crane screw.harbor machine screw,crusher screw,mechanical engineering screw,induding T type screw, rectangle head, double head, sole screw, drawing bar screw, hexagonal socket, outer six angle and all kinds of nonstandard high strength 8.8degree.10.9degree,12.9...
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