{"id":670,"date":"2025-10-29T07:35:51","date_gmt":"2025-10-29T07:35:51","guid":{"rendered":"https:\/\/mj-anchor.com\/product\/flat-head-hex-socket-bolts-din7991\/"},"modified":"2025-10-31T09:43:52","modified_gmt":"2025-10-31T09:43:52","slug":"flat-head-hex-socket-bolts-din7991","status":"publish","type":"product","link":"https:\/\/mj-anchor.com\/ar\/product\/flat-head-hex-socket-bolts-din7991\/","title":{"rendered":"Flat Head Hex Socket Bolts DIN7991"},"content":{"rendered":"<h4><strong>Product Details<\/strong><\/h4>\n<p>These screws are engineered for strength, aesthetics, and a flawless fit, with features tailored to specific environmental and performance needs.<\/p>\n<ul>\n<li><strong>DIN 7991 Countersunk Head:<\/strong> The screw features a flat-topped, conical head (typically with a 90-degree angle) that is designed to sit perfectly within a pre-drilled countersunk hole. This allows the head to become flush with the surrounding material, creating a smooth, safe, and visually appealing surface free of any protrusions.<\/li>\n<li><strong>Internal Hex Socket (Allen) Drive:<\/strong> The head incorporates an internal hexagonal recess, designed for use with a standard hex key (Allen wrench). This drive style allows for high-torque application without the risk of cam-out, ensuring a secure and reliable fastening while protecting the drive from external damage.<\/li>\n<li><strong>High-Strength Carbon Steel:<\/strong> These screws are forged from quality carbon steel and are available in a variety of property classes to handle different load requirements, including:\n<ul>\n<li><strong>Grade 8.8:<\/strong> A high-tensile steel ideal for most industrial, automotive, and structural applications.<\/li>\n<li><strong>Grade 10.9 &amp; 12.9:<\/strong> Very high-strength steels for critical, high-stress assemblies that demand maximum clamping force and load-bearing capacity.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Versatile Black Finish Options:<\/strong>\n<ul>\n<li><strong>Black Oxide:<\/strong> This is a conversion coating that turns the surface of the steel black. It provides mild corrosion resistance (best suited for dry, indoor environments or when oiled), enhances wear resistance, and offers a non-reflective matte finish. It causes minimal dimensional change, making it ideal for precision parts.<\/li>\n<li><strong>Black Zinc Plating:<\/strong> This finish involves electroplating a layer of zinc onto the steel, followed by a black chromate conversion coat. It provides significantly better corrosion resistance than black oxide, making it suitable for applications in damp or moderately corrosive environments while still providing a sleek black appearance.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4><strong>Product Parameters<\/strong><\/h4>\n<p>The technical specifications for our DIN 7991 Black Oxide \/ Black Zinc Hex Socket Countersunk Head Cap Screws are detailed below.<\/p>\n<div class=\"MarkdownTable_tableContainer__2k5Kh\" tabindex=\"0\" role=\"region\">\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Product Name<\/strong><\/td>\n<td>DIN 7991 Flat Head Hex Socket Bolt<\/td>\n<\/tr>\n<tr>\n<td><strong>Standard<\/strong><\/td>\n<td>DIN 7991<\/td>\n<\/tr>\n<tr>\n<td><strong>Material<\/strong><\/td>\n<td>Carbon Steel<\/td>\n<\/tr>\n<tr>\n<td><strong>Property Class \/ Grade<\/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, Black Zinc Plated<\/td>\n<\/tr>\n<tr>\n<td><strong>Head Style<\/strong><\/td>\n<td>Countersunk (CSK) \/ Flat Head<\/td>\n<\/tr>\n<tr>\n<td><strong>Drive Style<\/strong><\/td>\n<td>Internal Hex Socket (Allen)<\/td>\n<\/tr>\n<tr>\n<td><strong>Diameter Range<\/strong><\/td>\n<td>M4 &#8211; M24<\/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>Key Feature<\/strong><\/td>\n<td>Flush-mount design with aesthetic and protective black finishes<\/td>\n<\/tr>\n<tr>\n<td><strong>Application<\/strong><\/td>\n<td>Machinery, Electronics, Furniture, Heavy &amp; General Industry<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h4><strong>Product Features<\/strong><\/h4>\n<p>These high-performance screws are engineered to deliver a superior finish and reliable performance:<\/p>\n<ul>\n<li><strong>Perfect Flush-Mount Finish:<\/strong> The countersunk head design allows the screw to sit perfectly level with the material surface, ensuring a smooth, clean, and snag-free finish.<\/li>\n<li><strong>Dual Finish Versatility:<\/strong> Choose between Black Oxide for a non-reflective, wear-resistant finish ideal for machinery, or Black Zinc for enhanced corrosion protection in more demanding environments.<\/li>\n<li><strong>High Tensile Strength:<\/strong> Made from high-grade carbon steel (including 8.8, 10.9, and 12.9), these bolts provide the strength needed for secure, load-bearing joints.<\/li>\n<li><strong>Sleek Aesthetic:<\/strong> The uniform black finish provides a clean, professional look, making it a popular choice for visible fasteners in electronics, furniture, and automotive interiors.<\/li>\n<li><strong>Secure High-Torque Installation:<\/strong> The internal hex drive enables controlled, high-torque tightening for a solid and reliable connection without stripping the head.<\/li>\n<li><strong>DIN Standard Compliance:<\/strong> Manufactured to precise DIN 7991 standards, guaranteeing dimensional accuracy, consistent quality, and interchangeability.<\/li>\n<\/ul>\n<h4><strong>Product Applications<\/strong><\/h4>\n<p>The combination of a flush profile and versatile black finishes makes these screws ideal for a variety of industries:<\/p>\n<ul>\n<li><strong>Machinery and Tooling:<\/strong> Used for securing panels, guards, and fixtures where a non-protruding head is required and the black oxide finish reduces glare and adds wear resistance.<\/li>\n<li><strong>Electronics Enclosures:<\/strong> Perfect for assembling cases, racks, and faceplates, providing a clean, professional appearance.<\/li>\n<li><strong>Automotive:<\/strong> Ideal for interior trim, dashboard assemblies, and other components where a flush, non-reflective fastener is needed.<\/li>\n<li><strong>Furniture and Cabinetry:<\/strong> Used in high-end furniture and architectural woodworking to create strong, hidden joints with a modern aesthetic.<\/li>\n<li><strong>General Manufacturing:<\/strong> A versatile fastener for any assembly that requires a strong bolt with a clean, flush-mounted black finish.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Our DIN 7991 Hex Socket Countersunk Head Cap Screws are high-strength fasteners designed to provide a completely flush, professional finish in a wide range of assemblies. Manufactured from durable carbon steel and available in multiple strength grades, these screws are distinguished by their versatile black finish options: a classic Black Oxide for wear resistance and a sleek aesthetic, or a protective Black Zinc Plating for enhanced corrosion resistance. With their internal hex drive and flat head design, these screws are the premier choice for machinery, electronics, and automotive applications where a smooth, snag-free surface and a clean, non-reflective appearance are paramount.<\/p>","protected":false},"featured_media":1320,"template":"","meta":[],"product_brand":[],"product_cat":[195],"product_tag":[102,132,145,146,179,201],"class_list":{"0":"post-670","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-hex-socket-bolt","7":"product_tag-stainless-steel-anchor-bolts","8":"product_tag-anchor-bolts-manufacturer","9":"product_tag-hex-head-bolt","10":"product_tag-hex-bolts-and-nuts","11":"product_tag-hex-flange-bolt","12":"product_tag-hex-bolt-socket","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/product\/670","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/media\/1320"}],"wp:attachment":[{"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/media?parent=670"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/product_brand?post=670"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/product_cat?post=670"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/mj-anchor.com\/ar\/wp-json\/wp\/v2\/product_tag?post=670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}