Ningbo Zhongjiang High-Strength Bolts Co., Ltd. is an enterprise which specializes in manufacturing high strength fasteners, since it was founded in 1995. For the need of developing and researching of new products, it established a Sino-foreign joint venture company, namely Ningbo Zhongjiang Petroleum Pipes & Machinery Co., Ltd.Covering an area of 21,000 square meters, and a workshop of 15,000 square meters, our company has now 380 workers with 15 high-level technicians and 20 medium ones. We have a very huge test center, advanced test instruments and 200 sets equipment. Our products will be tested and identified in the mill steel, rigidity, tensile strength, tensional strength, eroding capacity and so on before delivery.Our major product categories are: bolts and stud bolts, and high strength nuts in standards of DIN, ANSI, BS and AS. Our new company is engaged in manufacturing oil piping matched products series of A193-B7, B7M, B16, A320-L7 and L7M. We had an export of 120,000,000 pi