Yongnian County West beachhead Naite fastener factory   

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bolt: from the head and screw (cylinder with external thread) is composed of two parts of a class of fasteners, need to be matched with a nut is used for fastening, connecting the two parts with hole.   this connection forms said connecting bolts. As the nut is unscrewed from the bolt, and can make the two parts separately, so the bolt connection is belongs to a detachable connection.
performance level of meaning is the international standard, bolt the same performance level, regardless of the material and the origin of the difference, its performance is the same, only performance levels can be selected design.
the strength grade of the so-called 8.8 level and 10.9 level refers to the shear stress level for the 8.8GPa and 10.9GPa
general is " X.Y" said strength, tensile strength of
(because according to the labeling regulations: the yield strength / tensile strength =Y/10)
Yongnian County Naite fastener factory is located in the country's largest standard fastening parts production base - Yongnian County of Hebei province Tiexi Hebei shop industrial zone, is a large enterprise specializing in the production of nuts. Our factory is a fastener, GB, GB nut, special, hot dip galvanized, electric thin buckle products such as professional production and processing companies, has a complete, scientific quality management system. Annual production of 3000 tons, long-term for the more than 20 electric power, mining, automobile, engineering machinery vehicle factory specialized supporting system.   measurement, testing equipment, the rational analysis equipment, salt spray test machine, hardness tester, tensile testing machine, raw materials from the entry to the whole process of Product Factory cloud all have perfect testing procedures.