{"id":66980,"date":"2026-04-20T13:34:08","date_gmt":"2026-04-20T13:34:08","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/din-440\/"},"modified":"2026-04-20T13:42:19","modified_gmt":"2026-04-20T13:42:19","slug":"din-440","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/din-440\/","title":{"rendered":"DIN 440"},"content":{"rendered":"<h2>Technical features and purpose of the DIN 440 standard<\/h2>\n<p>The DIN 440 standard regulates the parameters of extra-large washers with an increased outer diameter, optimized for use in bolted connections of heavy-duty wooden structures. Using these washers allows for a significant reduction in specific pressure on soft materials under the bolt head or nut, preventing crushing and damage to the integrity of the wood.<\/p>\n<h3>Sizes and design execution<\/h3>\n<p>The products are manufactured in two design modifications:<\/p>\n<ul>\n<li><strong>Type R:<\/strong> washers with a round central hole.<\/li>\n<li><strong>Type V:<\/strong> washers with a square hole.<\/li>\n<\/ul>\n<p>Technical requirements cover the range of nominal thread diameters from M5 to M52. The products comply with accuracy class C (coarse class), which is an optimal solution for general construction tasks. Deliveries from EV Group China include fasteners with various types of anti-corrosion protection, including electro-galvanizing and hot-dip galvanizing, ensuring the durability of connections in outdoor environments.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[116,122],"class_list":["post-66980","wiki","type-wiki","status-publish","hentry","wiki_category-din","wiki_category-standarty"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/66980","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\/66980\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=66980"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=66980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}