{"product_id":"m3-m5-black-hex-socket-countersunk-screws-a2-stainless","title":"M3–M5 Black Hex Socket Countersunk Screws – A2 Stainless Steel, Electrophoresis Black, Fully Threaded, 5–30mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n  \u003ch2\u003eM3–M5 Black Hex Socket Countersunk Screws — Flush Fit, Rust-Proof, Precision Black Finish\u003c\/h2\u003e\n  \u003cp\u003eWhen your project demands hardware that disappears into the surface — custom PC builds, black anodized panels, marine enclosures, or automotive trim — standard silver screws break the look. These M3, M4, and M5 hex socket countersunk screws are built for builders who care about the details.\u003c\/p\u003e\n  \u003cp\u003eMachined from A2 stainless steel (304) and coated with a durable electrophoresis black finish, each screw features a 90° flat countersunk head that sits perfectly flush after proper countersinking. Thread diameters M3–M5, lengths from 5 mm (~0.20 in) to 30 mm (~1.18 in) overall (head included), fully threaded, coarse pitch.\u003c\/p\u003e\n  \u003cp\u003eIdeal for electronics enclosures, black hardware builds, outdoor equipment, marine fittings, and any application where a low-profile, corrosion-resistant dark fastener is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n  \u003cspan class=\"hdiy-compat-icon\"\u003e✅\u003c\/span\u003e\n  Compatible with standard M3, M4, and M5 metric tapped holes, threaded inserts, and matching metric nuts. Hex socket drive requires 2 mm (M3), 2.5 mm (M4), or 3 mm (M5) Allen key.\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n  \u003ch2\u003e✅ Key Features of These Black Hex Socket Countersunk Screws\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔽\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003e90° Countersunk Flat Head:\u003c\/strong\u003e Sinks flush with the surface after countersinking — no protruding heads, clean and professional finish every time.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e⚫\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eElectrophoresis Black Finish:\u003c\/strong\u003e Uniform matte black coating with strong adhesion and salt-spray resistance. Adds corrosion protection on top of the stainless base.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eHex Socket (Allen) Drive:\u003c\/strong\u003e Allows high torque without cam-out. Clean recess resists dirt and debris buildup — ideal for precision assembly.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel (304) Core:\u003c\/strong\u003e Even if the black coating is scratched, the stainless base will not rust — a critical advantage over black-coated carbon steel alternatives.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eOverall Length Measurement (Head Included):\u003c\/strong\u003e Lengths of 5–30 mm are measured from the top of the head to the tip, per DIN 7991 \/ ISO 10642 standard. Fully threaded, coarse pitch.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eMultiple Pack Sizes Available:\u003c\/strong\u003e Choose from 10, 20, 50, 100, or 200 pcs — stock up for your project or buy just what you need.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-usecases\"\u003e\n  \u003ch2\u003e🎯 Who Is This For?\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e🖥️\u003c\/span\u003e\n    \u003cstrong\u003ePC Builders \u0026amp; Modders\u003c\/strong\u003e\n    \u003cp\u003eMount black anodized panels, GPU brackets, and custom chassis components with screws that blend seamlessly into your build aesthetic.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e⚓\u003c\/span\u003e\n    \u003cstrong\u003eMarine \u0026amp; Outdoor Projects\u003c\/strong\u003e\n    \u003cp\u003eA2 stainless steel with black coating handles salt air and moisture — perfect for boat fittings, outdoor enclosures, and weatherproof hardware.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eElectronics \u0026amp; Precision Assembly\u003c\/strong\u003e\n    \u003cp\u003eM3–M5 sizing covers the most common metric fastener needs in electronics enclosures, PCB standoffs, and instrument panels.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e🚗\u003c\/span\u003e\n    \u003cstrong\u003eAutomotive Trim \u0026amp; Custom Fabrication\u003c\/strong\u003e\n    \u003cp\u003eFlush-fit black screws for interior trim panels, carbon fiber parts, and custom fabrication where hardware visibility matters.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n  \u003ctable\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eGB\/T 70.3 \/ ISO 10642 \/ DIN 7991\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eElectrophoresis Black\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk \/ Flat (90°)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHex Socket (Allen)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eCoarse Metric, Fully Threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM3: 0.5 mm | M4: 0.7 mm | M5: 0.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eHex Key Size\u003c\/th\u003e\n\u003ctd\u003eM3: 2 mm | M4: 2.5 mm | M5: 3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eOverall Length (incl. head)\u003c\/th\u003e\n\u003ctd\u003e5, 6, 8, 10, 12, 16, 20, 25, 30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003ePack Size Options\u003c\/th\u003e\n\u003ctd\u003e10, 20, 50, 100, 200 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow is the length of these countersunk screws measured?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor countersunk flat head screws (DIN 7991), length is measured overall — from the top of the head to the tip. An M4 × 10 mm screw has a total length of 10 mm including the head. This matches our listing.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need to countersink the hole for a flush fit?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These are true 90° countersunk screws. To achieve a flush or slightly recessed finish, drill a matching 90° countersink hole using a countersink bit slightly larger than the head diameter.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre these screws fully threaded?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — all M3, M4, and M5 screws in this range (up to 30 mm overall length) are fully threaded from under the head to the tip, providing maximum grip in blind holes or through-nut applications.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill the black coating scratch or wear off? What about rust?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eElectrophoresis black bonds firmly to the steel and resists scratches better than paint. Heavy torque or contact with sharp metal may leave marks. However, the base material is A2 stainless steel — even if the coating wears, the screw itself will not rust. This is a major advantage over black-coated carbon steel screws.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat hex key (Allen key) size do I need?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eM3 uses a 2 mm Allen key, M4 uses 2.5 mm, and M5 uses 3 mm. Always use a quality hex key that fits snugly to avoid rounding the socket.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use these screws with a nut? What size nut fits?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — these are machine screws. Use standard metric nuts of the same thread size (M3, M4, or M5). They also thread into pre-tapped holes. Note: these are not self-tapping — for wood or plastic, use a threaded insert or a nut on the back.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the difference between electrophoresis black and regular black oxide?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eElectrophoresis (e-coat) applies a polymer coating via electrical charge, resulting in a uniform, well-adhered film with better corrosion resistance than traditional black oxide. Black oxide is a chemical conversion coating that offers minimal corrosion protection on its own and typically requires oil treatment.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre these screws magnetic?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA2 stainless steel is generally non-magnetic in its annealed state. However, cold working during manufacturing (such as thread rolling) can induce slight magnetism. For most applications this is not an issue, but if zero magnetism is critical, please verify with a magnet before use.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Thread Diameter, Length, and Qty above, then add to cart.\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 5 mm \/ 10 Pcs","offer_id":52259842785554,"sku":"PENGGB03520x10","price":5.59,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 6 mm \/ 10 Pcs","offer_id":52259842818322,"sku":"PENGGB03521x10","price":6.09,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8 mm \/ 10 Pcs","offer_id":52259842851090,"sku":"PENGGB03522x10","price":6.09,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10 mm \/ 10 Pcs","offer_id":52259842883858,"sku":"PENGGB03523x10","price":6.3,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12 mm \/ 10 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