{"id":639,"date":"2025-10-29T07:35:46","date_gmt":"2025-10-29T07:35:46","guid":{"rendered":"https:\/\/mj-anchor.com\/product\/black-hex-head-bolts\/"},"modified":"2025-10-31T03:01:51","modified_gmt":"2025-10-31T03:01:51","slug":"black-hex-head-bolts","status":"publish","type":"product","link":"https:\/\/mj-anchor.com\/fr\/product\/black-hex-head-bolts\/","title":{"rendered":"black hex head bolts"},"content":{"rendered":"<h4><strong>Crucial Clarifications on Product Specifications<\/strong><\/h4>\n<p>The product page contains several conflicting or ambiguous data points. The following clarifications provide an accurate understanding of this specific product:<\/p>\n<ul>\n<li><strong>Standard Confirmation:<\/strong> The product title correctly identifies the standard as <strong>DIN 933<\/strong>. This German standard specifies a hexagon head bolt with threads running the full length of the shank.<\/li>\n<li><strong>Finish Contradiction:<\/strong> The &#8220;Surface treatment&#8221; field lists &#8220;plain\/Black zinc plated,&#8221; while the &#8220;Finish&#8221; field correctly states <strong>&#8220;Black Oxide Coating.&#8221;<\/strong> These are different processes. &#8220;Black zinc&#8221; is an electroplating, whereas black oxide is a chemical conversion coating. Based on the dedicated &#8220;Finish&#8221; field and common industry practice for high-strength bolts, the correct finish is <strong>Black Oxide<\/strong>.<\/li>\n<li><strong>Material Inconsistency:<\/strong> The material is listed as &#8220;Stainless Steel\/Carbon Steel.&#8221; A black oxide finish is applied to ferrous metals like <strong>Carbon Steel and Alloy Steel<\/strong>, not stainless steel. Therefore, this is a carbon\/alloy steel bolt.<\/li>\n<li><strong>Grade Inconsistency:<\/strong> The grade list includes both carbon steel property classes (4.8, 8.8, 10.9, 12.9) and stainless steel grades (A2-70, A4-70). Only the <strong>carbon steel grades (4.8, 8.8, 10.9, 12.9)<\/strong> are applicable to this product.<\/li>\n<li><strong>Application Context:<\/strong> While the title mentions &#8220;Construction,&#8221; it is critical to note that the black oxide finish provides only minimal corrosion resistance. These bolts are suitable for <strong>indoor construction and structural applications<\/strong> but are <strong>not recommended for outdoor use<\/strong> or environments exposed to moisture, where they would be prone to rust.<\/li>\n<\/ul>\n<h4><strong>Product Parameters (Corrected and Clarified)<\/strong><\/h4>\n<div class=\"MarkdownTable_tableContainer__2k5Kh\" tabindex=\"0\" role=\"region\">\n<table>\n<thead>\n<tr>\n<th>Parameter Item<\/th>\n<th>Specification Description<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Product Name<\/strong><\/td>\n<td>Full-Threaded Hex Bolt<\/td>\n<\/tr>\n<tr>\n<td><strong>Standard<\/strong><\/td>\n<td>DIN 933<\/td>\n<\/tr>\n<tr>\n<td><strong>Brand Name<\/strong><\/td>\n<td>Duojia<\/td>\n<\/tr>\n<tr>\n<td><strong>Place of Origin<\/strong><\/td>\n<td>Hebei, China<\/td>\n<\/tr>\n<tr>\n<td><strong>Material<\/strong><\/td>\n<td>Carbon Steel \/ Alloy Steel<\/td>\n<\/tr>\n<tr>\n<td><strong>Grade (Strength)<\/strong><\/td>\n<td>4.8, 8.8, 10.9, 12.9<\/td>\n<\/tr>\n<tr>\n<td><strong>Surface Treatment<\/strong><\/td>\n<td>Black Oxide Coating<\/td>\n<\/tr>\n<tr>\n<td><strong>Size Range<\/strong><\/td>\n<td>M4 to M20<\/td>\n<\/tr>\n<tr>\n<td><strong>Measurement System<\/strong><\/td>\n<td>Metric<\/td>\n<\/tr>\n<tr>\n<td><strong>Application<\/strong><\/td>\n<td>Heavy Industry, General Industry, Machinery, Indoor Construction<\/td>\n<\/tr>\n<tr>\n<td><strong>Certifications<\/strong><\/td>\n<td>ISO9001, ISO14001, ISO45001, SGS<\/td>\n<\/tr>\n<tr>\n<td><strong>Packaging Options<\/strong><\/td>\n<td>Small Pack+Carton+Pallet; Bag\/Box with Pallet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h4><strong>DIN 933 Standard Explained<\/strong><\/h4>\n<p>The <strong>DIN 933<\/strong> standard is crucial as it defines the bolt&#8217;s geometry:<\/p>\n<ul>\n<li><strong>Hexagonal Head:<\/strong> For use with standard wrenches and sockets.<\/li>\n<li><strong>Full Thread:<\/strong> The shank is threaded along its entire length. This is advantageous when the full length of the bolt needs to engage with a tapped hole or when clamping force needs to be distributed over a longer threaded section with a nut.<\/li>\n<\/ul>\n<h4><strong>Carbon Steel Strength Grades Explained<\/strong><\/h4>\n<ul>\n<li><strong>Grade 8.8:<\/strong> A medium-to-high strength heat-treated carbon steel. It is a versatile and widely used grade for automotive, machinery, and structural applications requiring reliable load-bearing capacity.<\/li>\n<li><strong>Grade 10.9:<\/strong> A high-strength, heat-treated alloy steel. It is used for applications demanding high clamping force and tensile strength, such as in engines and heavy equipment connections.<\/li>\n<li><strong>Grade 12.9:<\/strong> The highest standard strength grade, made from heat-treated alloy steel. It is reserved for the most critical, high-stress fastening applications where maximum strength is essential.<\/li>\n<\/ul>\n<h4><strong>Key Features<\/strong><\/h4>\n<ul>\n<li><strong>Full Thread Engagement:<\/strong> The DIN 933 design provides threading along the entire bolt length, making it ideal for use in tapped holes or for applications where grip length is not a concern.<\/li>\n<li><strong>High-Strength Performance:<\/strong> Available in high-strength grades (8.8, 10.9, 12.9) suitable for securing heavy-duty components and load-bearing structures.<\/li>\n<li><strong>Aesthetic Black Finish:<\/strong> The black oxide coating provides a professional, non-reflective matte black look.<\/li>\n<li><strong>No Dimensional Change:<\/strong> The conversion coating does not add thickness, ensuring the bolt maintains its precise dimensions for tight-tolerance assemblies.<\/li>\n<\/ul>\n<h4><strong>Appropriate Applications<\/strong><\/h4>\n<ul>\n<li><strong>Machinery and Equipment Assembly:<\/strong> Ideal for fastening components where the bolt passes through a clearance hole and is secured with a nut.<\/li>\n<li><strong>Tapped Hole Fastening:<\/strong> Perfect for screwing directly into pre-threaded holes in metal blocks or frames.<\/li>\n<li><strong>Indoor Structural Connections:<\/strong> Used in steel framing and other construction applications that are protected from weather.<\/li>\n<li><strong>Automotive and Industrial Equipment:<\/strong> For securing parts in engines, transmissions, and other assemblies in dry environments.<\/li>\n<\/ul>\n<h4><strong>Installation Guidelines<\/strong><\/h4>\n<ol>\n<li>Align the components to be joined.<\/li>\n<li>Insert the DIN 933 hex bolt through the clearance hole or directly into the tapped hole.<\/li>\n<li>If using a nut, thread it onto the end of the bolt.<\/li>\n<li>Use a correctly sized open-end wrench or socket wrench that matches the hexagonal head to tighten the bolt.<\/li>\n<li>Tighten to the appropriate torque specification based on the bolt&#8217;s size, grade, and the application&#8217;s requirements to ensure a secure and stable connection. For best performance, keep the bolts lightly oiled to preserve the black oxide finish.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>The Duojia DIN 933 Hex Bolt is a high-strength fastener specifically designed for applications requiring maximum thread engagement and robust performance. Conforming to the DIN 933 standard, this bolt features a hexagonal head and is fully threaded from just under the head to the tip. Manufactured from high-strength carbon or alloy steel and finished with a black oxide coating, it is an ideal choice for machinery, industrial equipment, and structural connections in controlled, indoor environments.<\/p>","protected":false},"featured_media":1196,"template":"","meta":[],"product_brand":[],"product_cat":[143],"product_tag":[102,132,146,151,155,156],"class_list":{"0":"post-639","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-hex-bolt","7":"product_tag-stainless-steel-anchor-bolts","8":"product_tag-anchor-bolts-manufacturer","9":"product_tag-hex-bolts-and-nuts","10":"product_tag-m8-hex-bolt","11":"product_tag-stainless-hex-head-bolts","12":"product_tag-black-hex-head-bolts","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/product\/639","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/media\/1196"}],"wp:attachment":[{"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/media?parent=639"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/product_brand?post=639"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/product_cat?post=639"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/mj-anchor.com\/fr\/wp-json\/wp\/v2\/product_tag?post=639"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}