{"product_id":"m3-brass-countersunk-screws","title":"M3 Brass Phillips Countersunk Screws – Fully Threaded Flat Head, 5mm–25mm Lengths","description":"\u003c!-- Part 1: Product Description HTML for Shopify --\u003e\n\u003cdiv class=\"hdiy-brass-csk-screws\"\u003e\n\u003c!-- Product Overview Section --\u003e\n\u003ch2\u003e🔩 M3 Brass Phillips Countersunk Screws – Fully Threaded, Flat Head (5mm–25mm Lengths)\u003c\/h2\u003e\n\u003cp\u003eYou’re restoring an antique clock, building a decorative wooden box, or working on a marine electrical panel – and you need screws that look as good as they perform. These M3 brass countersunk screws combine the classic warmth of brass with the practicality of a Phillips drive. The flat head sinks flush into a pre‑drilled countersink, leaving a smooth, snag‑free surface. Made from solid brass, they resist corrosion, offer good conductivity, and develop a beautiful natural patina over time. Fully threaded from 5mm up to 25mm length (under head). Perfect for woodworking, instrument repair, boat fittings, and any project where ordinary steel screws would look out of place.\u003c\/p\u003e\n\u003c!-- Features Section --\u003e\n\u003ch2\u003e✨ Key Features – M3 Brass Countersunk Machine Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-feature-list\"\u003e\n\u003cli\u003e🔽 \u003cstrong\u003eCountersunk flat head (90°)\u003c\/strong\u003e – Designed to sit flush with the surface after countersinking. Ideal for a clean, professional finish on wood and soft metals.\u003c\/li\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eSolid brass construction\u003c\/strong\u003e – Naturally corrosion resistant, non‑magnetic, and electrically conductive. Develops an attractive patina over time – perfect for vintage or marine applications.\u003c\/li\u003e\n\u003cli\u003e📏\u003cbr\u003e\u003cstrong\u003ePhillips drive\u003c\/strong\u003e – Standard cross recess provides good torque transfer with reduced cam‑out compared to slotted drives.\u003c\/li\u003e\n\u003cli\u003e📏 \u003cstrong\u003eM3 metric thread (3mm diameter)\u003c\/strong\u003e – Widely used size for electronics, furniture, and light assembly.\u003c\/li\u003e\n\u003cli\u003e📐 \u003cstrong\u003eLengths from 5mm to 25mm (under head)\u003c\/strong\u003e – Available sizes: M3x5, M3x6, M3x8, M3x10, M3x12, M3x16, M3x20, M3x25. Fully threaded – maximum grip in shallow holes.\u003c\/li\u003e\n\u003cli\u003e✨ \u003cstrong\u003eSmooth, burr‑free finish\u003c\/strong\u003e – Precision machined threads for consistent fastening. No sharp edges.\u003c\/li\u003e\n\u003cli\u003e📦 \u003cstrong\u003ePlastic bag or carton box packaging\u003c\/strong\u003e – Keeps screws organized and protected.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Specifications Table --\u003e\n\u003ch2\u003e📏 Available Sizes – M3 Brass Countersunk Phillips Screws\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto;\" class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003cth\u003eLength (under head, mm)\u003c\/th\u003e\n\u003cth\u003eOverall Length (including head, approx.)\u003c\/th\u003e\n\u003cth\u003eFully Threaded\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e~5.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e~6.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e~8.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e~10.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e~12.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003e~16.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e~20.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e~25.8mm\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 0.85rem; margin-top: 0.5rem;\" class=\"hdiy-note\"\u003e📐 Length is measured from the underside of the head to the tip (grip length). All screws are fully threaded. Overall length includes the flat head (approx. +0.8mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Technical Specifications Table --\u003e\n\u003ch2\u003e📋 Full Specifications – Brass Countersunk Machine Screws\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto;\" class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM3 Brass Phillips Countersunk Flat Head Machine Screws\/Bolts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSolid brass (leaded or unleaded – standard brass alloy)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetric (GB\/T equivalent to DIN\/ISO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM3 (3mm nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5, 6, 8, 10, 12, 16, 20, 25 mm (under head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHead style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCountersunk \/ Flat (90° cone)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDrive style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePhillips (cross recess)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetric coarse (0.5mm pitch), fully threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCorrosion resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGood – suitable for indoor and light outdoor use (forms protective patina)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTypical applications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWoodworking, furniture, instrument repair, marine hardware, electronics, vintage restoration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- FAQ Section – all expanded --\u003e\n\u003ch2\u003e❓ Frequently Asked Questions – Brass Countersunk Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e1. Do I need to countersink the hole for these screws to sit flush?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eYes – for the head to be perfectly flush with the surface, you must drill a matching 90° countersink hole. Use a countersink bit slightly larger than the screw head diameter. In soft wood, you can sometimes tap the head in with a hammer, but proper countersinking gives a much cleaner result and prevents the wood from splitting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e2. Are these screws strong enough for furniture assembly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eBrass is softer than steel, so these screws are best for light to medium duty applications – think decorative hinges, small drawer pulls, instrument mounting, or electrical connections. For heavy structural loads (e.g., bed frames, shelving), use steel screws. For most furniture accents and light assembly, brass is perfectly adequate and looks beautiful.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e3. Will brass screws rust or tarnish over time?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eBrass does not rust (it contains no iron). It does develop a natural patina – first darkening, then sometimes turning greenish (verdigris) in humid or marine environments. Many people prefer this aged look for vintage projects. If you want to keep them shiny, apply a clear lacquer or polish periodically.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e4. Can I use these screws in marine or outdoor applications?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eYes – brass is corrosion‑resistant in saltwater and fresh water, making it a good choice for boat fittings, dock hardware, and outdoor furniture. However, avoid direct contact with aluminum or galvanized steel in wet conditions, as galvanic corrosion can occur (brass is more noble). Use isolation washers or dielectric grease if mixing metals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e5. How do I measure the length of a countersunk screw?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eFor countersunk flat head screws, the length is measured from the underside of the head (the bearing surface) to the tip. The head itself is not included in the length. So an “M3 x 10mm” screw has a 10mm long threaded portion under the head. Our list follows this standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e6. Do these screws come with matching brass nuts or washers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eThis listing is for screws only. We also sell brass hex nuts and flat washers separately – check our store for M3 brass hardware. Using brass nuts with brass screws ensures no galvanic issues and a consistent appearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e\n  .hdiy-brass-csk-screws {\n    max-width: 100%;\n    margin: 0;\n    padding: 0;\n    color: #1a1a1a;\n    line-height: 1.5;\n  }\n  .hdiy-brass-csk-screws h2 {\n    font-size: 1.75rem;\n    margin: 1.5rem 0 0.75rem 0;\n    font-weight: 600;\n    border-bottom: 2px solid #eaeaea;\n    padding-bottom: 0.5rem;\n  }\n  .hdiy-brass-csk-screws h2:first-of-type {\n    margin-top: 0;\n  }\n  .hdiy-brass-csk-screws p {\n    margin-bottom: 1rem;\n    font-size: 1rem;\n  }\n  .hdiy-feature-list {\n    list-style: none;\n    padding-left: 0;\n    margin: 1rem 0;\n  }\n  .hdiy-feature-list li {\n    margin-bottom: 0.75rem;\n    padding-left: 0.25rem;\n    font-size: 1rem;\n    display: flex;\n    align-items: flex-start;\n    gap: 0.5rem;\n  }\n  .hdiy-feature-list li strong {\n    font-weight: 600;\n  }\n  .hdiy-table-wrapper {\n    margin: 1.25rem 0;\n    border: 1px solid #e2e2e2;\n    border-radius: 8px;\n    background: #fff;\n    overflow-x: auto;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.9rem;\n    min-width: 400px;\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  }\n  .hdiy-note {\n    font-style: italic;\n    color: #555;\n  }\n  .hdiy-faq {\n    margin: 1.5rem 0;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.5rem;\n    padding-bottom: 0.5rem;\n    border-bottom: 1px solid #ececec;\n  }\n  .hdiy-faq-question {\n    margin-bottom: 0.25rem;\n    font-size: 1.05rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0.25rem;\n    color: #2c2c2c;\n  }\n  @media (max-width: 768px) {\n    .hdiy-brass-csk-screws h2 {\n      font-size: 1.5rem;\n    }\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n      font-size: 0.85rem;\n    }\n  }\n\u003c\/style\u003e","brand":"HomeDIYer","offers":[{"title":"M3*5 \/ 10","offer_id":52260267491602,"sku":"GLFBLLSGB10188x10","price":2.76,"currency_code":"USD","in_stock":true},{"title":"M3*5 \/ 20","offer_id":52260267524370,"sku":"GLFBLLSGB10188x20","price":3.18,"currency_code":"USD","in_stock":true},{"title":"M3*5 \/ 30","offer_id":52260267557138,"sku":"GLFBLLSGB10188x30","price":3.41,"currency_code":"USD","in_stock":true},{"title":"M3*5 \/ 50","offer_id":52260267589906,"sku":"GLFBLLSGB10188x50","price":4.01,"currency_code":"USD","in_stock":true},{"title":"M3*5 \/ 100","offer_id":52260267622674,"sku":"GLFBLLSGB10188x100","price":6.77,"currency_code":"USD","in_stock":true},{"title":"M3*6 \/ 10","offer_id":52260267655442,"sku":"GLFBLLSGB10189x10","price":3.17,"currency_code":"USD","in_stock":true},{"title":"M3*6 \/ 20","offer_id":52260267688210,"sku":"GLFBLLSGB10189x20","price":3.62,"currency_code":"USD","in_stock":true},{"title":"M3*6 \/ 30","offer_id":52260267720978,"sku":"GLFBLLSGB10189x30","price":4.07,"currency_code":"USD","in_stock":true},{"title":"M3*6 \/ 50","offer_id":52260267753746,"sku":"GLFBLLSGB10189x50","price":5.24,"currency_code":"USD","in_stock":true},{"title":"M3*6 \/ 100","offer_id":52260267786514,"sku":"GLFBLLSGB10189x100","price":9.23,"currency_code":"USD","in_stock":true},{"title":"M3*8 \/ 10","offer_id":52260267819282,"sku":"GLFBLLSGB10190x10","price":3.22,"currency_code":"USD","in_stock":true},{"title":"M3*8 \/ 20","offer_id":52260267852050,"sku":"GLFBLLSGB10190x20","price":3.71,"currency_code":"USD","in_stock":true},{"title":"M3*8 \/ 30","offer_id":52260267884818,"sku":"GLFBLLSGB10190x30","price":4.2,"currency_code":"USD","in_stock":true},{"title":"M3*8 \/ 50","offer_id":52260267917586,"sku":"GLFBLLSGB10190x50","price":5.93,"currency_code":"USD","in_stock":true},{"title":"M3*8 \/ 100","offer_id":52260267950354,"sku":"GLFBLLSGB10190x100","price":10.61,"currency_code":"USD","in_stock":true},{"title":"M3*10 \/ 10","offer_id":52260267983122,"sku":"GLFBLLSGB10191x10","price":3.32,"currency_code":"USD","in_stock":true},{"title":"M3*10 \/ 20","offer_id":52260268015890,"sku":"GLFBLLSGB10191x20","price":3.92,"currency_code":"USD","in_stock":true},{"title":"M3*10 \/ 30","offer_id":52260268048658,"sku":"GLFBLLSGB10191x30","price":4.5,"currency_code":"USD","in_stock":true},{"title":"M3*10 \/ 50","offer_id":52260268081426,"sku":"GLFBLLSGB10191x50","price":6.42,"currency_code":"USD","in_stock":true},{"title":"M3*10 \/ 100","offer_id":52260268114194,"sku":"GLFBLLSGB10191x100","price":11.59,"currency_code":"USD","in_stock":true},{"title":"M3*12 \/ 10","offer_id":52260268146962,"sku":"GLFBLLSGB10192x10","price":3.37,"currency_code":"USD","in_stock":true},{"title":"M3*12 \/ 20","offer_id":52260268179730,"sku":"GLFBLLSGB10192x20","price":4.01,"currency_code":"USD","in_stock":true},{"title":"M3*12 \/ 30","offer_id":52260268212498,"sku":"GLFBLLSGB10192x30","price":4.66,"currency_code":"USD","in_stock":true},{"title":"M3*12 \/ 50","offer_id":52260268245266,"sku":"GLFBLLSGB10192x50","price":6.94,"currency_code":"USD","in_stock":true},{"title":"M3*12 \/ 100","offer_id":52260268278034,"sku":"GLFBLLSGB10192x100","price":12.62,"currency_code":"USD","in_stock":true},{"title":"M3*16 \/ 10","offer_id":52260268310802,"sku":"GLFBLLSGB10193x10","price":3.52,"currency_code":"USD","in_stock":true},{"title":"M3*16 \/ 20","offer_id":52260268343570,"sku":"GLFBLLSGB10193x20","price":4.31,"currency_code":"USD","in_stock":true},{"title":"M3*16 \/ 30","offer_id":52260268376338,"sku":"GLFBLLSGB10193x30","price":5.45,"currency_code":"USD","in_stock":true},{"title":"M3*16 \/ 50","offer_id":52260268409106,"sku":"GLFBLLSGB10193x50","price":8.24,"currency_code":"USD","in_stock":true},{"title":"M3*16 \/ 100","offer_id":52260268441874,"sku":"GLFBLLSGB10193x100","price":15.23,"currency_code":"USD","in_stock":true},{"title":"M3*20 \/ 10","offer_id":52260268474642,"sku":"GLFBLLSGB10194x10","price":3.62,"currency_code":"USD","in_stock":true},{"title":"M3*20 \/ 20","offer_id":52260268507410,"sku":"GLFBLLSGB10194x20","price":4.58,"currency_code":"USD","in_stock":true},{"title":"M3*20 \/ 30","offer_id":52260268540178,"sku":"GLFBLLSGB10194x30","price":6.24,"currency_code":"USD","in_stock":true},{"title":"M3*20 \/ 50","offer_id":52260268572946,"sku":"GLFBLLSGB10194x50","price":9.57,"currency_code":"USD","in_stock":true},{"title":"M3*20 \/ 100","offer_id":52260268605714,"sku":"GLFBLLSGB10194x100","price":17.9,"currency_code":"USD","in_stock":true},{"title":"M3*25 \/ 10","offer_id":52260268638482,"sku":"GLFBLLSGB10195x10","price":3.71,"currency_code":"USD","in_stock":true},{"title":"M3*25 \/ 20","offer_id":52260268671250,"sku":"GLFBLLSGB10195x20","price":4.77,"currency_code":"USD","in_stock":true},{"title":"M3*25 \/ 30","offer_id":52260268704018,"sku":"GLFBLLSGB10195x30","price":6.54,"currency_code":"USD","in_stock":true},{"title":"M3*25 \/ 50","offer_id":52260268736786,"sku":"GLFBLLSGB10195x50","price":10.06,"currency_code":"USD","in_stock":true},{"title":"M3*25 \/ 100","offer_id":52260268769554,"sku":"GLFBLLSGB10195x100","price":18.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/5d1d8f88-a3bf-4169-9497-8d0f4213baea.jpg?v=1778920289","url":"https:\/\/homediyer.com\/products\/m3-brass-countersunk-screws","provider":"HomeDIYer","version":"1.0","type":"link"}