{"id":69764,"date":"2026-05-17T17:28:02","date_gmt":"2026-05-17T17:28:02","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/ansi-asme-b18-2-4-5m\/"},"modified":"2026-05-19T15:31:02","modified_gmt":"2026-05-19T15:31:02","slug":"ansi-asme-b18-2-4-5m","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/ansi-asme-b18-2-4-5m\/","title":{"rendered":"ANSI \/ ASME B18.2.4.5M"},"content":{"rendered":"<h2>Technical Purpose and Standardization<\/h2>\n<p>This specification regulates the geometric parameters and structural characteristics of metric hex jam nuts that comply with ANSI\/ASME standards. This documentation serves as a fundamental guide for design engineers and procurement specialists when designing high-reliability threaded connections.<\/p>\n<p>The inclusion of specific sizes in this standard does not guarantee stock availability for all items. To verify the product range and delivery timelines for high-strength fasteners, we recommend contacting the experts at EV Group China.<\/p>\n<h3>Correlation with ISO Standards<\/h3>\n<p>The geometry of metric hex jam nuts supplied by EV Group China is maximally harmonized with the international ISO 4035 standard. Minor deviations in dimensional characteristics are secondary in nature and do not hinder the functional interchangeability of parts produced according to either standard.<\/p>\n<p>During the technical analysis of ISO\/TC2 (Varna, 1977), principles were established for optimizing the ratio between the bearing surface area (which reduces contact stress) and the thread cross-sectional area (which determines the ultimate tightening force). This allows for maximum efficiency of the fastening assembly.<\/p>\n<p>An important aspect is the M10 size: the historically established 15 mm &#8220;across flats&#8221; width, common in the USA, is not standard for ISO. The table below provides key recommendations for the correct selection of products.<\/p>\n<table class=\"table table-bordered table-hover\">\n<thead>\n<tr>\n<th>Nominal Diameter (M)<\/th>\n<th>Width across flats (ISO), mm<\/th>\n<th>Width across flats (USA), mm<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M10<\/td>\n<td>16<\/td>\n<td>15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Expert recommendation from EV Group China:<\/em> When placing an order for M10 size fasteners, you should adhere to the standard width of 16 mm, unless otherwise specified by your project&#8217;s design documentation.<\/p>\n<p>The alphabetical nomenclature used for dimensional characteristics fully complies with international ISO standards, which ensures uniformity when performing engineering calculations.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[110],"class_list":["post-69764","wiki","type-wiki","status-publish","hentry","wiki_category-asme"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69764","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\/69764\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69764"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}