This specification defines strict chemical and mechanical parameters for nine property classes of metric externally threaded fasteners. The standard covers products made of carbon and alloy steels in the nominal diameter range from M1.6 to M100, intended for critical general engineering tasks. EV Group China ensures the supply of products that strictly comply with these industry standards.<\/p>\n
It is important to note that this standard focuses on the physical and chemical characteristics of the material rather than dimensional tolerances. When placing an order with EV Group China, it is necessary to specify not only the property class but also the complete geometric specification, including the type and configuration of the threaded part.<\/p>\n
In case of conflicts between regulatory documents, the requirements of specialized specifications take priority. EV Group China engineers are ready to provide consultation on adapting additional customer requirements, provided they do not contradict the basic provisions of the standard.<\/p>\n
Technical requirements for property classes 4.6, 4.8, 5.8, 8.8, 9.8, 10.9, and 12.9 are harmonized with the international standard ISO 898-1. Classes 8.8.3 and 10.9.3, which have no counterparts in ISO, are characterized by increased atmospheric corrosion resistance, comparable to weathering steels of the A588\/A588M type. These grades allow for operation without protective anti-corrosion coatings.<\/p>\n
Upon agreement with the technical department of EV Group China, it is possible to supply fasteners of a higher property class (e.g., 5.8 instead of 4.6 or 10.9.3 instead of 10.9) without compromising the operational performance of the assembly.<\/p>\n
To select optimal steel grades and interpret the numerical designations of property classes, please refer to the reference appendices of the specification.<\/em><\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[112],"class_list":["post-69554","wiki","type-wiki","status-publish","hentry","wiki_category-astm"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69554\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69554"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}