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Ningbo Zhenghai Yongding Fastener Co.,Ltd.specially produces fasteners, bolts etc. We have all kinds of automatic equipments of manufacturing and testing. 
Now the company is manufacturing various kinds of high quality hex bolts, hex structural bolt, railwary bolt ,threaded rod (studding) and purchase many kinds of nuts from other vendors.. The products meet all the international criterion of GB, DIN, ISO, ANSI/ASME, BS. The products are widely used in numerous domestic enterprises and national key construction projects and exported to European, American and Southeast Asian ...