Threaded Studs Tolerance
Each fastener product is covered by several aspects of the content of the standard:
1) Fastener Product Dimensions Standard: Specified on the basic dimensions of the product; threaded product, also includes the basic dimensions of the thread, thread finish, shoulder distance, undercut and chamfer, end of the external thread part Size and other aspects of content.
2) fasteners product technical conditions of the standard. Specifically includes the following aspects of the content of the standard:
a) Criteria for the Tolerance of Fastener Products: Specified on the tolerances and geometric tolerances of the product dimensions.
b) Criteria for the mechanical properties of fastener products: the labeling method for the mechanical grade of the product and the contents of the mechanical performance items and requirements; and some fastener products change this material to product material performance or performance Aspects of the content.
c) Fastener product surface defects in the standard: the specific provisions of the product surface defects and specific requirements of the content and so on.
d) surface treatment of fastener products standards: the specific provisions of the product surface treatment types and specific requirements and other aspects.
e) Criteria for fastener product testing: specify the performance of the various performance requirements described above.
3) Fastener product acceptance inspection, marking and packaging standards: the specific provisions of the product factory inspection and inspection items qualified quality level and sampling program, as well as product logo methods and packaging requirements of the content.
4) Criteria for Fast Marking Product Marking Methods: Specific provisions for the complete labeling method and simplified labeling method.
5) other aspects of fasteners standards: such as the terms of fasteners terms, fasteners, the weight of the product standards.
1 standard (commonly used in German standard and American standard)
GB (national standard) ISO (international standard)
To fasteners as the representative of the basic pieces, not only China's equipment manufacturing industry, the basic industry, but also an important basis for all areas of national economic construction. Twelve five period loaders, excavators
To fasteners as the representative of the basic pieces, not only China's equipment manufacturing industry, the basic industry, but also an important basis for all areas of national economic construction. The second half of the loader, excavators, rollers and other construction machinery products will reach 600 million units, annual sales of about 50,000 units, according to estimates, the demand for high-strength fasteners about 20,000 to 30,000 Ton.
In recent years, although the introduction of technology, technological transformation, scientific research and development, the state has given some support, but with the current market demand and foreign levels, there is still a small gap, specifically in: product variety, low level , The quality of instability, early failure rate is high, poor reliability.