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,12.9degree and screw cap.We also produce hydraulic pressure pipefitting, pipe tie-in, pipe cap,pipe casting,hose assembly and so on.We are an exprot oriented ...