{"id":69555,"date":"2026-05-17T17:26:56","date_gmt":"2026-05-17T17:26:56","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/astm-f3148\/"},"modified":"2026-05-19T15:29:33","modified_gmt":"2026-05-19T15:29:33","slug":"astm-f3148","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/astm-f3148\/","title":{"rendered":"ASTM F3148"},"content":{"rendered":"<h2>Technical specifications and scope of ASTM F3148<\/h2>\n<p>This specification establishes strict requirements for the physical and mechanical properties, chemical composition, and geometric parameters of high-strength carbon and alloy steel bolts supplied in imperial units. EV Group China products compliant with the F3148 standard are complete fastener assemblies consisting of a bolt with a special splined end, a specialized nut, and at least one washer.<\/p>\n<h3>Engineering purpose<\/h3>\n<p>Fasteners in this category are intended for use in critical structural steel applications. Assembly is performed using &#8220;torque-to-turn&#8221; or combined methods that ensure controlled pretensioning force. The standard covers a range of bolts with nominal thread diameters from \u00bd to 1 \u00bc inches.<\/p>\n<h3>Classification and marking<\/h3>\n<p>Structural elements are classified as Grade 144. The steel type selection is determined by service conditions and corrosion resistance requirements:<\/p>\n<ul>\n<li>Type 1 (144 ksi) \u2014 carbon, boron-containing, or alloy steels subjected to quenching and tempering.<\/li>\n<li>Type 3 (144 ksi) \u2014 weathering alloy steels suitable for service in aggressive environments without additional protective coatings.<\/li>\n<\/ul>\n<p>The terminology used within this specification fully complies with the provisions of the ASTM F1789 standard. The splined bolt is a precision component featuring a shaft with vertical grooves at the end beyond the threaded section, providing a secure grip for installation tools.<\/p>\n<h3>Installation technology<\/h3>\n<p>EV Group China kits are optimized for automated assembly using specialized electric torque tools. During tightening, the tool&#8217;s inner socket grips the splined shaft to prevent rotation, while the outer socket rotates the nut. Two-stage control (torque application followed by a specified rotation angle) ensures the achievement of design connection characteristics.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[112],"class_list":["post-69555","wiki","type-wiki","status-publish","hentry","wiki_category-astm"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69555","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\/69555\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69555"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}