{"product_id":"solid-brass-flat-countersunk-phillips-machine-screws-m4-6-40mm","title":"Solid Brass Flat Countersunk Phillips Machine Screws — M4, 6mm–40mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSolid Brass Flat Countersunk Phillips Machine Screws — Flush Fit and Lasting Corrosion Resistance in One M4 Fastener\u003c\/h2\u003e\n\u003cp\u003eWhether you’re assembling fine furniture, fitting decorative cabinet hardware, building a wooden jewelry box, or finishing a bathroom fixture, a protruding screw head is never the look you want. These solid brass flat countersunk Phillips machine screws deliver a clean, flush finish with the warm, distinctive appearance that only real brass provides — making them the go-to M4 fastener for woodworkers, makers, and hardware enthusiasts who care about the details.\u003c\/p\u003e\n\u003cp\u003eEach screw is machined from solid brass (not plated) and features a flat countersunk head with a Phillips (cross) drive. Available in M4 diameter across ten lengths: 6mm (15\/64”), 8mm (5\/16”), 10mm (3\/8”), 12mm (15\/32”), 16mm (5\/8”), 20mm (25\/32”), 25mm (1”), 30mm (1-3\/16”), 35mm (1-3\/8”), and 40mm (1-9\/16”). Choose from pack sizes of 5, 10, 20, 40, 60, 100, or 200 pieces to match your project scale.\u003c\/p\u003e\n\u003cp\u003eThese brass countersunk machine screws are a natural fit for cabinet and furniture assembly where a flush, decorative fastener is required; for marine and bathroom fittings where corrosion resistance matters in humid environments; and for instrument cases, wooden enclosures, and DIY home improvement projects where a non-magnetic, rust-resistant M4 fastener is the right call.\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 Metric thread (ISO standard) — fits standard M4 metric nuts, threaded inserts, and tapped holes. Use a matching 90° countersink bit for a flush-fit installation.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Solid Brass Countersunk Phillips 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\u003eSolid Brass Construction\u003c\/strong\u003e — Machined from solid brass, not plated steel, delivering genuine corrosion resistance and a consistent warm-gold appearance that holds up over time in humid or decorative applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⬇️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlat Countersunk Head\u003c\/strong\u003e — Sits completely flush with the surface when installed in a properly countersunk hole, eliminating snag points and creating a clean, finished look on wood, plastic, and soft metal.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e➕\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePhillips Drive for Easy Installation\u003c\/strong\u003e — Compatible with any standard PH2 Phillips screwdriver or power drill bit, making installation fast and straightforward without specialty tools.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e10 Length Options in One Listing\u003c\/strong\u003e — From 6mm (15\/64”) to 40mm (1-9\/16”), this single M4 listing covers the full range of light-to-medium duty fastening depths, so you can find the right length without hunting across multiple products.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🚫🧲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eNon-Magnetic Material\u003c\/strong\u003e — Brass is inherently non-magnetic, making these screws a reliable choice for instrument hardware, electronics enclosures, and applications near sensitive components where steel fasteners would cause interference.\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 — Order exactly what you need: 5-piece packs for small repairs, or 200-piece packs for larger builds and workshop stock — all at a consistent per-unit value.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — M4 Brass Flat Countersunk Machine Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSolid Brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFlat Countersunk\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003ePhillips (Cross \/ PH2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric (ISO), M4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM4 (4mm \/ 5\/32” nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e6mm (15\/64”), 8mm (5\/16”), 10mm (3\/8”), 12mm (15\/32”), 16mm (5\/8”), 20mm (25\/32”), 25mm (1”), 30mm (1-3\/16”), 35mm (1-3\/8”), 40mm (1-9\/16”)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e5, 10, 20, 40, 60, 100, 200 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountersink Angle\u003c\/th\u003e\n\u003ctd\u003eTypically 90° — confirm with countersink bit spec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnetic\u003c\/th\u003e\n\u003ctd\u003eNo (brass is non-magnetic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Applications\u003c\/th\u003e\n\u003ctd\u003eCabinetry, furniture, bathroom fittings, instrument hardware, wooden enclosures, DIY home improvement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Warehouse\u003c\/th\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right screw length for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA reliable rule of thumb is to select a length where at least two-thirds of the screw engages the base material. For example, if your top panel is 8mm thick, a 20mm (25\/32”) screw generally provides solid holding power. The countersunk head sits flush with — not above — the surface, so the full listed length contributes to grip depth. When in doubt, size up rather than down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre solid brass M4 screws strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSolid brass M4 machine screws are generally well-suited for light-to-medium duty fastening in wood, MDF, plastic, and soft metals. They are commonly used in furniture, cabinetry, instrument hardware, and decorative fittings. Brass is softer than steel, so these screws are not recommended for high-load structural connections or applications subject to heavy vibration — in those cases, stainless steel or hardened steel fasteners are typically the better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these screws outdoors or in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — brass is naturally corrosion-resistant and performs well in humid indoor environments and light outdoor use, such as garden furniture, bathroom fittings, and covered exterior trim. For prolonged exposure to saltwater, coastal air, or standing water, a marine-grade stainless steel fastener is generally more appropriate for long-term durability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these screws follow, and what are they compatible with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are standard ISO metric machine screws. M4 refers to a 4mm nominal thread diameter. They are compatible with any standard metric M4 nut, threaded insert, or tapped hole manufactured to the ISO 68-1 thread profile. They are \u003cem\u003enot\u003c\/em\u003e compatible with UNC\/UNF (imperial) threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the head sit completely flush with the surface?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided you use a countersink bit to prepare the hole before driving the screw. The flat countersunk head is designed to sit flush when the countersink angle matches the screw head angle — typically 90°. Using a countersink bit of the correct angle and diameter for M4 will give you a perfectly flush, snag-free finish. Driving the screw without countersinking first will leave the head proud of the surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many screws come in each pack, and which quantity should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach listing is available in seven pack sizes: \u003cstrong\u003e5, 10, 20, 40, 60, 100, or 200 pieces\u003c\/strong\u003e. For a small repair or prototype, the 5- or 10-piece pack is usually sufficient. For furniture builds, cabinetry runs, or workshop stock, the 60- to 200-piece packs offer better value per screw. Select your preferred quantity from the \u003cem\u003ePack Quantity\u003c\/em\u003e option above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat screwdriver or bit do I need to drive these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese M4 screws use a standard Phillips (cross) drive. A \u003cstrong\u003ePH2\u003c\/strong\u003e bit is typically the correct fit for M4 screws. Always match the bit size carefully — using an undersized bit can cause cam-out and damage the drive recess, especially in softer brass. For best results, use a hand screwdriver or set your drill to a low torque setting to avoid over-driving.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your length and pack quantity above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4*6 mm \/ 5","offer_id":52253900505362,"sku":"A3830-0","price":1.89,"currency_code":"USD","in_stock":true},{"title":"M4*6 mm \/ 10","offer_id":52253900538130,"sku":"A3830-1","price":2.03,"currency_code":"USD","in_stock":true},{"title":"M4*6 mm \/ 20","offer_id":52253900570898,"sku":"A3830-2","price":2.43,"currency_code":"USD","in_stock":true},{"title":"M4*6 mm \/ 40","offer_id":52253900603666,"sku":"A3830-3","price":4.07,"currency_code":"USD","in_stock":true},{"title":"M4*6 mm \/ 60","offer_id":52253900636434,"sku":"A3830-4","price":5.56,"currency_code":"USD","in_stock":true},{"title":"M4*6 mm \/ 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