{"product_id":"12-9-grade-torx-flat-head-machine-screws-carbon-steel-m1-6-to-m6","title":"12.9 Grade Torx Flat Head Machine Screws — Carbon Steel, M1.6 to M6","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003ch2\u003e12.9 Grade Torx Countersunk Machine Screws — Maximum Strength Carbon Steel, M1.6 to M6\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003cp\u003eWhen a standard Phillips or hex screw strips under torque — or when your assembly simply cannot afford a fastener failure — you need a higher-strength solution with a drive that stays engaged. Engineers, precision machinists, robotics builders, and demanding DIYers working with tight-tolerance assemblies rely on Grade 12.9 Torx flat head countersunk machine screws to deliver the clamping force and drive reliability that lower-grade fasteners can’t match.\u003c\/p\u003e\n\u003cp\u003eEach order contains your chosen quantity (10, 20, or 50 pieces) of a single size. Thread diameters span M1.6, M1.8, M2, M2.2, M2.5, M3, M3.5, M4, M4.5, M5, and M6, with lengths ranging from 4mm (≈5\/32”) to 18mm (≈11\/16”). The flat countersunk head sits flush with or below the mating surface when installed in a properly countersunk hole. Two sub-types are available: standard Grade 12.9 carbon steel (50 pcs packs) and High Hardness variants (10 pcs packs) for applications requiring additional surface hardness and wear resistance. All screws use a Torx (T-star \/ six-lobe) drive recess.\u003c\/p\u003e\n\u003cp\u003eTypical applications include precision robotics and CNC machine assembly where high-torque Torx countersunk screws for mechanical frames prevent cam-out during automated fastening, electronics enclosure and rack-mount hardware where flush-mount Grade 12.9 screws keep panel surfaces smooth and snag-free, and automotive or motorsport component fabrication where carbon steel countersunk fasteners for high-stress brackets must hold under vibration and thermal cycling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric thread standard — M1.6 through M6, standard coarse pitch. Compatible with metric nuts, threaded inserts, and tapped holes of the corresponding diameter. Requires a Torx (T-star) driver bit — see FAQ for bit size guidance per diameter.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 12.9 Grade Torx Countersunk Machine Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💪\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eGrade 12.9 Tensile Strength\u003c\/strong\u003e — At the top of the common metric strength scale, Grade 12.9 carbon steel delivers a minimum tensile strength of 1220 MPa — significantly stronger than Grade 8.8 or 10.9 fasteners — making these screws suitable for high-load mechanical assemblies where fastener integrity is critical.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⭐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTorx Six-Lobe Drive — No Cam-Out\u003c\/strong\u003e — The six-lobe Torx recess distributes torque across six contact points, dramatically reducing cam-out compared to Phillips or slotted drives. This is especially valuable in automated assembly lines and high-torque hand-tightening where drive slippage would damage the recess or the workpiece.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlush Countersunk Head Profile\u003c\/strong\u003e — The flat head is engineered to sit flush with or recessed below the surface in a countersunk hole, delivering a smooth, low-profile finish on panels, frames, and enclosures — no protruding heads to interfere with mating parts or create snag points.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy‑icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e — Manufactured from carbon steel and heat-treated to Grade 12.9 specification, these screws offer the hardness and toughness needed for demanding fastening tasks in mechanical, automotive, and industrial applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧪\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStandard \u0026amp; High Hardness Options\u003c\/strong\u003e — Choose standard Grade 12.9 (50 pcs packs) for general high-strength fastening, or select the High Hardness variants (10 pcs packs) for applications requiring additional surface hardness and resistance to deformation under repeated torquing cycles.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📌\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMicro to Small Diameter Range — M1.6 Through M6\u003c\/strong\u003e — With sizes starting at M1.6 (4mm \/ ≈5\/32” length), these screws cover the fine-pitch fastening needs of electronics, optics, and precision instruments, while larger sizes up to M6 × 18mm (≈11\/16”) handle medium-duty structural connections.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Torx Flat Head Countersunk Machine Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eTorx (Six-Lobe) Flat Head Countersunk Machine Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003e12.9 (standard variants); High Hardness (select variants — see size options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel, heat-treated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eTorx \/ T-star (six-lobe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFlat \/ Countersunk (flush-mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric, standard coarse pitch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Thread Diameters\u003c\/th\u003e\n\u003ctd\u003eM1.6, M1.8, M2, M2.2, M2.5, M3, M3.5, M4, M4.5, M5, M6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e4mm (≈5\/32”) — 18mm (≈11\/16”); availability varies by diameter — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eISO standard coarse pitch per diameter; Contact us to confirm if fine pitch is required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantities\u003c\/th\u003e\n\u003ctd\u003e10 pcs (High Hardness variants), 20 pcs (M6 sizes), 50 pcs (standard variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Strength (Grade 12.9)\u003c\/th\u003e\n\u003ctd\u003eTypically ≥1220 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003ePrecision machinery, robotics, electronics enclosures, automotive fabrication, high-torque assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eNote:\u003c\/strong\u003e These are carbon steel screws. Without a corrosion-resistant coating, prolonged exposure to moisture or salt environments may cause surface oxidation. For outdoor or marine applications, apply a protective coating after installation or contact us about coated variants.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right screw length for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA general guideline: the engaged thread length in the base material should be at least 1.5–2× the screw diameter. For example, an M3 screw should typically engage at least 4.5–6mm of thread in the base. Measure the total stack thickness of all clamped layers, then add the required thread engagement depth. For a flush countersunk installation, also account for the head depth in your countersink — the head should sit at or below the surface, not above it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does Grade 12.9 mean, and how strong are these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGrade 12.9 is the highest common metric strength classification for machine screws. It indicates a minimum tensile strength of 1220 MPa and a proof load of approximately 1100 MPa. These screws are significantly stronger than Grade 8.8 or 10.9 fasteners and are typically used in high-stress mechanical assemblies, precision equipment, and applications where fastener failure is not acceptable. Always apply the correct torque specification for the diameter and grade to avoid over-tightening.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these screws suitable for outdoor or corrosive environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are carbon steel screws without a specified corrosion-resistant coating. For outdoor, humid, or salt-spray environments, we recommend applying a thread-locking compound or anti-corrosion coating after installation, or contacting us to confirm whether a coated variant is available. For inherently corrosion-resistant fastening, stainless steel alternatives are generally a better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat Torx bit size do I need for each screw diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTorx (six-lobe) bit sizes generally correspond to screw diameter as follows: T4–T5 for M1.6–M2, T6–T8 for M2.5–M3, T10–T15 for M3.5–M4, and T20–T25 for M5–M6. Always verify the exact socket size against your specific screw before applying torque, as sizing can vary slightly by manufacturer. Using an undersized bit can strip the recess; using an oversized bit will not seat properly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the standard and High Hardness variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe standard variants (50 pcs packs) are Grade 12.9 carbon steel Torx countersunk screws suitable for most high-strength fastening applications. The “High Hardness” variants (10 pcs packs) are additionally processed for greater surface hardness, making them suitable for applications with higher wear resistance requirements or where the screw must resist deformation under repeated torquing. Contact us to confirm the specific hardness specification if your application has defined requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy use a Torx drive instead of Phillips or hex socket?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTorx (six-lobe) drive geometry distributes torque more evenly across six contact points, which significantly reduces cam-out — the tendency of the driver to slip out of the recess under high torque. This makes Torx drives well-suited for high-torque applications, automated assembly, and situations where repeated installation and removal are required without damaging the drive recess. Compared to hex socket (Allen) drives, Torx generally offers better torque transfer at smaller head sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these screws follow — are they compatible with standard metric hardware?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws follow the ISO metric thread standard with standard coarse pitch for each diameter (e.g., M3 × 0.5mm pitch, M4 × 0.7mm pitch). They are generally compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding diameter. Contact us to confirm pitch if fine-thread compatibility is required for your assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M2 x 4mm \/ 50 Pcs","offer_id":52285454647570,"sku":"DGYCXDG-THS262235x1","price":10.09,"currency_code":"USD","in_stock":true},{"title":"M2 x 5mm \/ 50 Pcs","offer_id":52285454680338,"sku":"DGYCXDG-THS262236x1","price":10.09,"currency_code":"USD","in_stock":true},{"title":"M2 x 6mm \/ 50 Pcs","offer_id":52285454713106,"sku":"DGYCXDG-THS262237x1","price":10.09,"currency_code":"USD","in_stock":true},{"title":"M2 x 8mm \/ 50 Pcs","offer_id":52285454745874,"sku":"DGYCXDG-THS262238x1","price":10.09,"currency_code":"USD","in_stock":true},{"title":"M2 x 10mm \/ 50 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