{"product_id":"grade-12-9-torx-countersunk-screws-m3-m5","title":"M3 M4 M5 Grade 12.9 Torx Countersunk Machine Screws – SCM435 Alloy Steel, Fully Threaded (4–16mm)","description":"\u003cstyle\u003e\n  \/* 统一前缀 hdiy-，避免样式冲突 *\/\n  .hdiy-product-wrap {\n    margin: 0;\n    padding: 0;\n  }\n  .hdiy-product-wrap h2,\n  .hdiy-product-wrap h3 {\n    margin-top: 1.5em;\n    margin-bottom: 0.5em;\n    font-weight: 600;\n  }\n  .hdiy-product-wrap p {\n    margin-bottom: 1em;\n    line-height: 1.5;\n  }\n  .hdiy-features-list {\n    list-style: none;\n    padding-left: 0;\n  }\n  .hdiy-features-list li {\n    margin-bottom: 0.75em;\n    padding-left: 1.5em;\n    position: relative;\n    line-height: 1.4;\n  }\n  .hdiy-features-list li::before {\n    content: \" \";\n    position: absolute;\n    left: 0;\n    top: 0;\n  }\n  .hdiy-table-wrapper {\n    overflow-x: auto;\n    margin: 1.2em 0;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.95rem;\n    background: #fff;\n    min-width: 300px;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n    width: 35%;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.25rem;\n    border-bottom: 1px solid #eee;\n    padding-bottom: 0.75rem;\n  }\n  .hdiy-faq-question {\n    font-weight: 700;\n    margin-bottom: 0.35rem;\n    font-size: 1rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0;\n    line-height: 1.45;\n    color: #2c2c2c;\n  }\n  @media (max-width: 640px) {\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n    }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"hdiy-product-wrap\"\u003e\n  \n  \u003c!-- Product Overview --\u003e\n  \u003ch2\u003e🔩 Product Overview: Grade 12.9 Torx Countersunk Machine Screws – SCM435 Alloy Steel (M3–M5)\u003c\/h2\u003e\n  \u003cp\u003eWhen your project demands the highest level of strength and reliability, standard fasteners won't cut it. These Grade 12.9 Torx countersunk machine screws are made from SCM435 alloy steel, hardened and tempered to deliver exceptional tensile strength and wear resistance. The internal Torx (six‑lobe) drive provides superior torque transfer with zero cam‑out, while the flat countersunk head sits flush for a smooth, professional finish. Fully threaded with standard metric coarse pitch, available in M3, M4, and M5 diameters with lengths from 4mm to 16mm (measured under the head). Galvanized surface treatment adds corrosion resistance. Perfect for CNC machine tools, tool holders, heavy machinery, automotive, and any high‑stress industrial application.\u003c\/p\u003e\n  \n  \u003c!-- Key Features List --\u003e\n  \u003ch2\u003e✨ Why These Grade 12.9 Torx Screws Are Built for Demanding Applications\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features-list\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGrade 12.9 high tensile strength\u003c\/strong\u003e – Ultra‑high hardness and excellent wear resistance. Withstands extreme loads and repeated use without failure.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSCM435 alloy steel construction\u003c\/strong\u003e – Chromium‑molybdenum alloy steel, hardened and tempered for superior mechanical properties.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInternal Torx (six‑lobe) drive\u003c\/strong\u003e – Eliminates cam‑out, distributes torque evenly, and allows precise tightening without damaging the recess.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCountersunk flat head (90°)\u003c\/strong\u003e – Sits flush in tapered holes for a snag‑free, professional finish – ideal for tooling and machine assemblies.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFully threaded, coarse metric pitch\u003c\/strong\u003e – Standard threads: M3x0.5, M4x0.7, M5x0.8. Threads run the entire shank length for maximum grip.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGalvanized surface treatment\u003c\/strong\u003e – Provides rust protection and long service life in various working environments.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrecision CNC machining\u003c\/strong\u003e – Stable dimensions, smooth burr‑free surface, and easy installation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWide industrial applications\u003c\/strong\u003e – CNC machine tools, tool holders, lathes, mechanical assembly, mold fixing, automotive, motorcycle, and precision engineering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003c!-- Specifications Table --\u003e\n  \u003ch2\u003e📏 Technical Specifications – Grade 12.9 Torx Countersunk Screws (M3–M5)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrapper\"\u003e\n    \u003ctable class=\"hdiy-specs-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eTorx Countersunk Flat Head Machine Screws (Six‑lobe drive)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003e12.9 (high tensile strength)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSCM435 Alloy Steel (Cr‑Mo alloy)\n        \u003c\/td\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eInternal Torx (six‑lobe) – use T10 for M3, T20 for M4, T25 for M5 (approx.)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk flat head (90°)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSystem of Measurement\u003c\/th\u003e\n\u003ctd\u003eMetric\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Sizes (Diameter)\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch (coarse)\u003c\/th\u003e\n\u003ctd\u003eM3x0.5, M4x0.7, M5x0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFully threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Range (under head)\u003c\/th\u003e\n\u003ctd\u003e4mm – 16mm (select from options; typical: 4, 5, 6, 8, 10, 12, 14, 16mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eZinc plated (galvanized) – corrosion resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePackaging\u003c\/th\u003e\n\u003ctd\u003ePlastic bag \/ cardboard box\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \n  \u003c!-- Frequently Asked Questions --\u003e\n  \u003ch2\u003e❓ FAQs – Grade 12.9 Torx Countersunk Screws\u003c\/h2\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What makes Grade 12.9 screws stronger than standard Grade 8.8 or 10.9?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eGrade 12.9 is the highest common metric strength class for steel screws. It has a tensile strength of 1220 MPa and a proof strength of 970 MPa – significantly higher than Grade 8.8 (640 MPa yield) and Grade 10.9 (830 MPa yield). The SCM435 alloy steel is heat‑treated for maximum hardness and durability, making these screws ideal for high‑stress industrial applications.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Are these screws fully threaded? How is length measured?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eYes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the head. For example, an M4 x 12mm screw has a 12mm threaded shank. This matches standard countersunk screw measurement.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What Torx bit size do I need for M3, M4, and M5?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eTypical Torx sizes: M3 uses T10, M4 uses T20, M5 uses T25. Always check fit before applying torque – a quality Torx bit set (T6–T30) is recommended for these sizes.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will galvanized coating prevent rust?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eZinc plating (galvanized) provides good corrosion resistance for indoor and light outdoor use. For constant moisture, saltwater, or chemical exposure, stainless steel would be a better choice. These screws are designed for industrial machinery and tooling environments where moderate humidity is present.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use these screws with nuts, or are they for tapped holes only?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eThese are standard machine screws – they work with matching metric nuts (M3–M5) or in pre‑tapped holes. For full strength, use Grade 10 or higher nuts to match the 12.9 screw strength.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What are the typical applications for Grade 12.9 countersunk screws?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eCNC machine tools, tool holders, lathe turrets, mold fixtures, industrial machinery, heavy equipment assembly, automotive drivetrain components, motorcycle parts, and any high‑vibration or high‑load application where a flush finish is required.\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Standard model \/ M2×4","offer_id":52284944515346,"sku":"DGZCL-THS262235x1","price":11.46,"currency_code":"USD","in_stock":true},{"title":"Standard model \/ M2×5","offer_id":52284944548114,"sku":"DGZCL-THS262236x1","price":11.46,"currency_code":"USD","in_stock":true},{"title":"Standard model \/ 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