{"id":4342,"date":"2026-03-13T11:10:59","date_gmt":"2026-03-13T03:10:59","guid":{"rendered":"https:\/\/machinedwasher.com\/?post_type=product&#038;p=4342"},"modified":"2026-03-13T15:21:16","modified_gmt":"2026-03-13T07:21:16","slug":"flat-head-bolts-2","status":"publish","type":"product","link":"https:\/\/machinedwasher.com\/tr\/products\/flat-head-bolts-2\/","title":{"rendered":"Flat Head Bolts Carbon Steel Furniture Grade ISO 9001 Certified Custom Non-Standard M6-M12 Zinc Plated"},"content":{"rendered":"<h2>What are Flat Head Bolts?<\/h2>\n<p class=\"ds-markdown-paragraph\">Flat head bolts (common reference standards: DIN 7991, ISO 10642, ASME B18.5) feature a 90\u00b0 countersunk head design that sits flush with the material surface. Unlike pan head or round head bolts, which protrude above the surface, flat head bolts eliminate interference points, allow components to slide freely, and create smooth, professional finishes where clearance or aesthetics matter.<\/p>\n<hr \/>\n<h2>Material<\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Carbon Steel:<\/strong>\u00a0Property classes 4.8 (400 MPa tensile), 8.8 (800 MPa tensile), 10.9 (1040 MPa tensile), and 12.9 (1220 MPa tensile) [verify] deliver increasing load capacity for structural applications.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Stainless Steel:<\/strong>\u00a0A2-70 (70,000 psi tensile, equivalent to 304 grade) offers general corrosion resistance; A4-80 (80,000 psi tensile, equivalent to 316 grade) provides enhanced resistance to chlorides and marine environments.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Alloy Steel:<\/strong>\u00a0SCM435 chromium-molybdenum alloy [verify] meets high-strength requirements for automotive and heavy equipment assemblies after heat treatment.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>Surface Finishes<\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Zinc Plated:<\/strong>\u00a0Delivers 48+ hours [verify] salt spray protection. First choice for general industrial indoor applications balancing cost and corrosion resistance.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Black Oxide:<\/strong>\u00a0Provides cosmetic dark finish with minimal corrosion protection. Spec for tooling, automotive interiors, and light-duty applications where oil film supplements protection.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Dacromet:<\/strong>\u00a0Offers zinc-aluminum coating for high-corrosion environments. Resists 500+ hours [verify] salt spray without hydrogen embrittlement risk.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Plain (Uncoated):<\/strong>\u00a0Use with thread-locking compounds or sealants. Specify for post-plating assemblies or controlled indoor environments.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>Specification Parameters<\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Diameter:<\/strong>\u00a0M3 through M24 metric; #4 through 1-inch imperial<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Length:<\/strong>\u00a06mm to 200mm metric; 1\/4-inch through 8-inch imperial<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Head Angle:<\/strong>\u00a090\u00b0 countersunk standard (critical for flush mounting verification)<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Drive Types:<\/strong>\u00a0Hex socket (most common), Torx, slotted, Phillips, external hex<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>Vertical Application Scenarios<\/h2>\n<p class=\"ds-markdown-paragraph\"><strong>Precision Sheet Metal Enclosures:<\/strong>\u00a0Flat head bolts join thin-gauge panels without protruding heads. The 90\u00b0 angle seats perfectly in countersunk holes, allowing adjacent components to mount flush against the surface.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Automated Equipment Rail Systems:<\/strong>\u00a0Linear guide rails require low-profile fastening to prevent carriage interference. Flat head bolts mount below the rail surface, maintaining uninterrupted travel paths for bearings and sliders.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Outdoor Electrical Cabinets:<\/strong>\u00a0Utility enclosures pair flat head bolts with sealing washers. The flush head allows gaskets to seal continuously around the fastener, preventing water ingress while maintaining a professional appearance.<\/p>\n<h2>Customer Case<\/h2>\n<p class=\"ds-markdown-paragraph\"><strong>Situation:<\/strong>\u00a0A conveyor system manufacturer reported recurring product jams at transfer points. Protruding hex head bolts securing guide rails caught product packages, causing line stoppages and damaged goods.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Task:<\/strong>\u00a0Engineering required flush-mounted fasteners that maintained full clamping strength while eliminating all surface protrusions. Assembly access from one side remained mandatory for field maintenance.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Action:<\/strong>\u00a0Supplied\u00a0<strong>M8 x 25mm flat head bolts, property class 8.8, zinc-plated, with hex socket drive<\/strong>. The 90\u00b0 countersunk head seated flush with rail surfaces. Socket drive enabled one-sided installation with standard hex keys.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Result:<\/strong>\u00a0The manufacturer reported complete elimination of jam-related downtime. Maintenance crews continued using existing tools, and the flush surface allowed packages to transfer smoothly across all conveyor junctions.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-4350\" src=\"https:\/\/machinedwasher.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_20260313112856_22_31.jpg\" alt=\"\" width=\"255\" height=\"255\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>Flat Head Bolts Carbon Steel Furniture Grade ISO 9001 Certified Custom Non-Standard M6-M12 Zinc Plated<\/p>","protected":false},"featured_media":4349,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[3086],"product_tag":[3128,3133,3137,3138,3135,3125,3126,3131,3132,3129,3140,3139,3136,3097,3098,3130,3134,3127],"class_list":{"0":"post-4342","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-machined-bolts","7":"product_tag-black-flat-head-bolts","8":"product_tag-countersunk-bolts","9":"product_tag-countersunk-bolts-and-nuts","10":"product_tag-countersunk-bolts-m6","11":"product_tag-countersunk-bolts-m8","12":"product_tag-flat-head-bolts","13":"product_tag-flat-head-bolts-and-nuts","14":"product_tag-flat-head-lag-bolts","15":"product_tag-head-bolts","16":"product_tag-large-flat-head-bolts","17":"product_tag-m10-countersunk-bolts","18":"product_tag-m3-countersunk-bolts","19":"product_tag-m8-countersunk-bolts","20":"product_tag-machine-bolts","21":"product_tag-machine-bolts-and-nuts","22":"product_tag-metric-flat-head-bolts","23":"product_tag-stainless-countersunk-bolts","24":"product_tag-stainless-steel-flat-head-bolts","26":"first","27":"instock","28":"shipping-taxable","29":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product\/4342","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/comments?post=4342"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/media\/4349"}],"wp:attachment":[{"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/media?parent=4342"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product_brand?post=4342"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product_cat?post=4342"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/machinedwasher.com\/tr\/wp-json\/wp\/v2\/product_tag?post=4342"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}