{"product_id":"m3-phillips-flat-head-machine-screws-carbon-steel-countersunk","title":"M3 Phillips Flat Head Machine Screws – Carbon Steel Countersunk Bolts, 3 mm to 15 mm","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for M3 countersunk screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule: the screw length should equal the thickness of the material being fastened plus enough thread engagement in the base material — typically 1.5× the screw diameter (≈4.5 mm for M3). For example, joining a 3 mm panel to a base would generally call for a 6–8 mm screw. Available lengths here range from 3 mm (≈1\/8\\u2033) to 15 mm (≈19\/32\\u2033).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What head diameter should I choose — 4.3 mm, 4.6 mm, 4.7 mm, 4.8 mm, 5 mm, or 5.2 mm?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The head diameter determines how wide the countersink recess needs to be. A larger head spreads load over a wider area, which is generally better for softer materials like wood or plastic. For metal-to-metal applications, a smaller head (4.3–4.8 mm) typically fits standard countersink tooling. Check your countersink bit or pre-drilled hole spec before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these M3 carbon steel screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel M3 screws are generally rated at property class 4.8 or higher, providing adequate tensile strength for light-to-medium duty assembly tasks. For precise load ratings, consult the datasheet for your specific finish and grade, or contact us to confirm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these screws be used outdoors or in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black zinc and white zinc coatings offer moderate corrosion resistance suitable for indoor and sheltered applications. Bright nickel provides a decorative finish with similar protection. For prolonged outdoor or marine exposure, stainless steel fasteners are generally recommended. If in doubt, contact us to confirm suitability for your environment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these M3 screws use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are metric M3 screws with a standard coarse thread pitch of 0.5 mm, compatible with M3 nuts, threaded inserts, and tapped holes following ISO metric standards. They are not compatible with UNC\/UNF inch-standard threads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the standard and 'With Glue' variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 'Black Zinc With Glue' variant features a pre-applied thread-locking adhesive patch on the threads. This helps prevent loosening from vibration without requiring a separate liquid threadlocker. It is ideal for assemblies subject to repeated vibration, such as motor mounts or machinery panels.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which finish should I choose — black zinc, white zinc, or bright nickel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black zinc offers a matte dark appearance and is commonly used in electronics enclosures and automotive interiors. White zinc provides a silver-grey look with good corrosion resistance for general hardware. Bright nickel delivers a shiny decorative finish suited for visible consumer product assemblies. Choose based on your aesthetic requirements and environment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces do I need to order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These screws are available in quantities of 100, 200, 300, 400, and 500 pieces per order. Larger quantities offer a lower per-unit cost, making them well-suited for production runs, workshop stock, or bulk DIY projects.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM3 Phillips Countersunk Flat Head Screws — Flush-Fit Carbon Steel Fasteners for Clean, Professional Assemblies\u003c\/h2\u003e\n    \u003cp\u003eWhen a protruding screw head isn't an option — whether you're assembling electronics enclosures, cabinetry, automotive trim panels, or precision DIY fixtures — you need a fastener that sits perfectly flush. Loose, ill-fitting screws ruin the look of a finished project and can snag wiring or interfere with mating surfaces. These M3 Phillips countersunk flat head screws are built for makers, technicians, and workshop professionals who demand a clean result every time.\u003c\/p\u003e\n    \u003cp\u003eEach set contains carbon steel M3 countersunk screws with a Phillips (cross) drive, available in thread lengths from 3 mm (≈1\/8\") to 15 mm (≈19\/32\") and head diameters ranging from 4.3 mm to 5.2 mm. Finish options include Black Zinc, Bright Nickel, White Zinc, and a Black Zinc With Glue variant featuring a pre-applied thread-locking patch. Pack sizes run from 100 to 500 pieces, letting you stock exactly what your project demands.\u003c\/p\u003e\n    \u003cp\u003eThese M3 flat head machine screws are a go-to choice for electronics chassis assembly, 3D printer frame construction, and thin-panel woodworking or metalworking projects where a flush countersunk surface is required. The metric M3 thread (0.5 mm pitch) ensures compatibility with standard M3 tapped holes, threaded inserts, and hex nuts across a wide range of DIY and light industrial applications.\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    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard M3 metric coarse thread (0.5 mm pitch) — fits M3 nuts, threaded inserts, and ISO-standard tapped holes. Not compatible with UNC\/UNF inch threads. Confirm countersink angle and head diameter against your tooling before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M3 Phillips Countersunk Flat Head 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\u003ePhillips Cross Drive\u003c\/strong\u003e — The familiar cross-head recess works with standard #1 and #2 Phillips screwdrivers and bits, making these M3 flat head bolts easy to drive by hand or with a power tool in tight spaces.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTrue Countersunk Profile\u003c\/strong\u003e — The flat-head countersunk geometry allows the screw to sit completely flush with or below the surface, eliminating snag points in electronics enclosures, panel assemblies, and furniture joints.\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 — Carbon steel provides reliable tensile strength for light-to-medium duty fastening tasks, making these screws suitable for machine assembly, 3D printer frames, and general workshop fabrication.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eThree Finish Options\u003c\/strong\u003e — Choose Black Zinc for a matte dark look in electronics or automotive interiors, Bright Nickel for a polished decorative finish, or White Zinc for a classic silver-grey appearance with solid corrosion resistance.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eThread-Lock Variant Available\u003c\/strong\u003e — The Black Zinc With Glue option features a factory-applied thread-locking adhesive patch, ideal for vibration-prone assemblies like motor mounts or machinery panels without the mess of liquid threadlocker.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 100, 200, 300, 400, and 500-piece packs so you can match your order to a single project or keep your workshop stocked for ongoing M3 countersunk screw needs.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M3 Phillips Countersunk Flat Head Machine Screws\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003ePhillips (Cross \/ PH)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk Flat Head\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM3 (3 mm \/ ≈0.118\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e0.5 mm (ISO metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e3 mm (≈1\/8\"), 4 mm (≈5\/32\"), 4.5 mm, 4.8 mm, 5 mm (≈3\/16\"), 6 mm (≈1\/4\"), 8 mm (≈5\/16\"), 10 mm (≈3\/8\"), 15 mm (≈19\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Diameter Options\u003c\/th\u003e\n\u003ctd\u003e4.3 mm, 4.6 mm, 4.7 mm, 4.8 mm, 5 mm, 5.2 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish \/ Coating\u003c\/th\u003e\n\u003ctd\u003eBlack Zinc \/ Bright Nickel \/ White Zinc \/ Black Zinc With Glue (thread-lock patch)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric (M3 × 0.5)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Sizes\u003c\/th\u003e\n\u003ctd\u003e100 \/ 200 \/ 300 \/ 400 \/ 500 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountersink Angle\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\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eHeads up:\u003c\/strong\u003e Head diameter varies by variant (4.3 mm – 5.2 mm). Please verify your countersink recess dimensions before ordering to ensure a flush fit.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for M3 countersunk screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule: the screw length should equal the thickness of the material being fastened plus enough thread engagement in the base material — typically 1.5× the screw diameter (≈4.5 mm for M3). For example, joining a 3 mm panel to a base would generally call for a 6–8 mm screw. Available lengths here range from 3 mm (≈1\/8\") to 15 mm (≈19\/32\"). When in doubt, size up — you can always trim thread engagement with a washer, but a screw that's too short won't hold.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat head diameter should I choose — 4.3 mm, 4.6 mm, 4.7 mm, 4.8 mm, 5 mm, or 5.2 mm?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe head diameter determines how wide the countersink recess needs to be. A larger head spreads clamping load over a wider area, which is generally better for softer materials like wood or plastic. For metal-to-metal applications, a smaller head (4.3–4.8 mm) typically fits standard countersink tooling. Check your countersink bit spec or pre-drilled hole diameter before selecting a variant.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these M3 carbon steel screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eCarbon steel M3 screws are generally rated at property class 4.8 or higher, providing adequate tensile strength for light-to-medium duty assembly tasks such as electronics chassis, 3D printer frames, and thin-panel fixtures. For precise load ratings in structural or safety-critical applications, contact us to confirm the specific grade for your chosen variant.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these screws be used outdoors or in humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eBlack zinc and white zinc coatings offer moderate corrosion resistance suitable for indoor and sheltered applications. Bright nickel provides a decorative finish with similar protection levels. For prolonged outdoor exposure, coastal environments, or direct water contact, stainless steel fasteners are generally recommended. Contact us if you need guidance on finish suitability for your specific environment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these M3 screws use — are they compatible with my nuts and inserts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese are metric M3 screws with a standard coarse thread pitch of 0.5 mm, fully compatible with M3 nuts, M3 threaded inserts (heat-set or press-fit), and tapped holes following ISO metric standards. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF inch-standard threads. If you're using them with heat-set inserts in 3D-printed parts, M3 × 0.5 is the most common insert size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the standard and \"With Glue\" variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe \u003cem\u003eBlack Zinc With Glue\u003c\/em\u003e variant features a factory-applied thread-locking adhesive patch on the threads. This patch activates under the clamping pressure of installation and helps prevent loosening from vibration — no separate liquid threadlocker needed. It is well-suited for motor mounts, fan brackets, machinery panels, and any assembly subject to repeated vibration or thermal cycling.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich finish should I choose — black zinc, white zinc, or bright nickel?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eChoose based on your aesthetic and environment: \u003cstrong\u003eBlack Zinc\u003c\/strong\u003e gives a matte dark appearance commonly used in electronics enclosures, automotive interiors, and industrial equipment. \u003cstrong\u003eWhite Zinc\u003c\/strong\u003e provides a silver-grey look with solid general-purpose corrosion resistance. \u003cstrong\u003eBright Nickel\u003c\/strong\u003e delivers a shiny, polished finish suited for visible consumer product assemblies where appearance matters. All three finishes are applied over carbon steel.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces should I order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese M3 flat head screws are available in 100, 200, 300, 400, and 500-piece packs. For a single project, 100 pcs is typically sufficient for most small assemblies. Workshop restocking or production runs benefit from 300–500 pcs packs, which offer a lower per-unit cost. Mix and match sizes and finishes across separate orders to build a complete M3 fastener kit.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your material, size, and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Carbon Steel \/ Black Zinc \/ M3 x 3 mm Head Dia 5mm \/ 100 PCS","offer_id":52285036724498,"sku":"GYJLTJLWJ02788x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M3 x 4 mm Head Dia 4.3mm \/ 100 PCS","offer_id":52285036757266,"sku":"GYJLTJLWJ02789x1","price":5.1,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 4 mm Head Dia 4.3mm \/ 100 PCS","offer_id":52285036790034,"sku":"GYJLTJLWJ02790x1","price":9.83,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 4 mm Head Dia 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PCS","offer_id":52285036986642,"sku":"GYJLTJLWJ02796x1","price":10.51,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M3 x 5 mm Head Dia 5mm \/ 100 PCS","offer_id":52285037019410,"sku":"GYJLTJLWJ02797x1","price":10.85,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 5 mm Head Dia 5mm \/ 100 PCS","offer_id":52285037052178,"sku":"GYJLTJLWJ02798x1","price":11.74,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 6 mm Head Dia 4.3mm \/ 100 PCS","offer_id":52285037084946,"sku":"GYJLTJLWJ02799x1","price":12.42,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M3 x 6 mm Head Dia 4.3mm \/ 100 PCS","offer_id":52285037117714,"sku":"GYJLTJLWJ02800x1","price":12.42,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 6 mm Head Dia 4.7mm \/ 100 PCS","offer_id":52285037150482,"sku":"GYJLTJLWJ02801x1","price":11.19,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M3 x 6 mm Head Dia 4.7mm \/ 100 PCS","offer_id":52285037183250,"sku":"GYJLTJLWJ02802x1","price":11.19,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/  White Zinc \/ M3 x 6 mm Head Dia 5mm \/ 100 PCS","offer_id":52285037216018,"sku":"GYJLTJLWJ02803x1","price":11.4,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M3 x 6 mm Head Dia 5mm \/ 100 PCS","offer_id":52285037248786,"sku":"GYJLTJLWJ02804x1","price":11.4,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 6 mm Head Dia 5mm \/ 100 PCS","offer_id":52285037281554,"sku":"GYJLTJLWJ02805x1","price":11.4,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 8 mm Head Dia 4.8mm \/ 100 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