{"id":69773,"date":"2026-05-17T17:28:05","date_gmt":"2026-05-17T17:28:05","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/en-iso-12474\/"},"modified":"2026-05-19T15:31:06","modified_gmt":"2026-05-19T15:31:06","slug":"en-iso-12474","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/en-iso-12474\/","title":{"rendered":"EN ISO 12474"},"content":{"rendered":"<h2>Technical description and application scope of the EN ISO 12474 standard<\/h2>\n<p>The EN ISO 12474 standard regulates the geometric parameters and technical requirements for high-strength hex socket head cap screws. A key feature of these products is the use of a fine-pitch metric thread, which provides increased vibration resistance and positioning accuracy in machine assemblies. The range of nominal thread diameters covers values from 8 to 36 mm. The products are manufactured in accordance with accuracy class A, which guarantees high tolerances and stability of geometric dimensions.<\/p>\n<p>EV Group China supplies fasteners that comply with these technical regulations. Reference data on the theoretical weight of products for calculating logistics loads is provided in Annex A of the standard.<\/p>\n<h3>Technical delivery conditions and performance characteristics<\/h3>\n<table class=\"table table-bordered table-hover\">\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Steel<\/th>\n<th>Stainless Steel<\/th>\n<th>Non-ferrous Metal<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>General requirements<\/td>\n<td colspan=\"3\">ISO 8992<\/td>\n<\/tr>\n<tr>\n<td>Thread tolerance class<\/td>\n<td colspan=\"3\">5g\/6g (for property class 12.9); 6g (for other classes). According to ISO 261, ISO 965-2, ISO 965-3.<\/td>\n<\/tr>\n<tr>\n<td>Mechanical properties (property class)<\/td>\n<td>8.8, 10.9, 12.9 (ISO 898-1)<\/td>\n<td>d&lt;24 mm: A2-70, A3-70, A4-70, A5-70; 24-36 mm: A2-50, A3-50, A4-50, A5-50 (ISO 3506-1)<\/td>\n<td>According to specification (ISO 8839)<\/td>\n<\/tr>\n<tr>\n<td>Tolerances (class)<\/td>\n<td colspan=\"3\">A (ISO 4759-1)<\/td>\n<\/tr>\n<tr>\n<td>Surface quality<\/td>\n<td>Electroplating (ISO 4042), zinc flake coating (ISO 10683)<\/td>\n<td>Plain<\/td>\n<td>Plain or electroplating (ISO 4042)<\/td>\n<\/tr>\n<tr>\n<td>Allowable surface defects<\/td>\n<td>ISO 6157-1; ISO 6157-3 (for property class 12.9)<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>Inspection and testing methods<\/td>\n<td colspan=\"3\">ISO 3269<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[120],"class_list":["post-69773","wiki","type-wiki","status-publish","hentry","wiki_category-iso"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69773","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\/69773\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69773"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}