Slewing ring is nearly four decades in the world gradual rise of new mechanical parts, it has inner and outer rings, rolling, etc., at present, China's production of slewing stereotypes, mainly in the early 1980s designated by the Ministry of Machinery Industry, Tianjin Engineering Institute of Mechanical former Federal Republic of Germany to introduce the organization Rothe Erde's design and manufacturing technology. December 20, 1984 released the People's Republic of China Ministry of Machinery Industry Standards: JB/2300-84 "slewing Types, basic parameters and technical requirements", mainly by the Ministry of Machinery and Electronics Industry, Tianjin Institute of Mechanical Engineering, responsible for drafting, and later the State has released a standard construction machinery in 1991: JB36.1-36.3-91, in 1999 and 2011 has released new machinery industry standard JB/2300-1999 and JB/2300-2011. Needle roller bearing outer ring is thin steel precision stamping, structure small space, and has a large load capacity. For mounting space is limited and should not be used as housing bore raceway occasions. And pressed into the bearing hole without further axial positioning. Ma Bearing Co., Ltd. is located in Luoyang Luoyang of nine dynasties, is a production and sales of large, extra large, import substitution and non-standard special structure bearing joint-stock enterprises. My company has strong technical force, engineers and technicians accounted for 18% of the number of enterprises, skilled workers have been several rigorous training and technical level assessment, strict work style, technical excellence. Production equipment and testing instruments Ryoma Bearing Co., fully able to meet all types, size, precision grade bearings and special processing requirements, production process according to the enterprise internal control standards stricter than national standards and seized the whole of the product integrated multi-project test manufactured products, the factory can guarantee the quality of each bearing products meet or exceed national standards. Our company regards quality as life, customer is God, in order to meet customer expectations, the striving for national oversize bearing industry leading companies as their goals and rewards caring for customers. Our range of product specifications for the internal diameter of Φ200 ~ Φ4500mm, widely used in machine tools, petrochemical, mining, metallurgical equipment, power generation equipment, heavy machinery, building materials, construction machinery, oil rigs, steel ball processing equipment, defense industry and technology and other cutting-edge equipment product sales covered more than 20 provinces and cities, with domestic customers to establish a good economic and trade relations. Our company has obtained GB/T19001-2000idtISO9001: 2000 "quality system certification certificate" and bearing export ISO9001: 2000 "Quality System Registration Certificate", bearing products are exported to America, Europe, Australia and Southeast Asian countries. Ma Luoyang Bearing Co., Ltd. Contact: Zhuxing Li