{"product_id":"a2-stainless-phillips-countersunk-flat-head-machine-screws-m3-gb-t819-4-80mm","title":"A2 Stainless Steel Phillips Countersunk Flat Head Machine Screws M3 GB\/T 819 — 4mm to 80mm, Variable Pack Quantities","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eA2 Stainless Steel Phillips Countersunk Flat Head Machine Screws M3 GB\/T 819 — Flush-Fit Rust-Proof Screws from 4mm to 80mm for Panels, Electronics \u0026amp; Precision DIY\u003c\/h2\u003e\n\u003cp\u003eFinding a single M3 countersunk screw in the right length — especially at 40mm, 60mm, or 80mm — usually means ordering from multiple suppliers or buying far more than you need. These \u003cstrong\u003eA2 stainless steel Phillips countersunk flat head machine screws in M3 to GB\/T 819\u003c\/strong\u003e cover the full range from M3×4mm (0.16”) to M3×80mm (3.15”) in a single listing, with 24 length options and variable pack quantities scaled to screw length.\u003c\/p\u003e\n\u003cp\u003eThe 90° countersunk head sits flush with or below the surface when driven into a properly countersunk hole, eliminating snag points and delivering a clean finish on panels, enclosures, and woodwork. GB\/T 819 is dimensionally compatible with ISO 7046 and DIN 965 — these screws are interchangeable with metric countersunk screws to those standards. A2 (304) stainless steel provides reliable corrosion resistance without the weight or cost of larger fasteners.\u003c\/p\u003e\n\u003cp\u003eTypical applications include electronics enclosure and panel mounting where a flush surface is required, woodworking and joinery projects, bracket and fixture assembly, equipment repair and maintenance specifying M3 countersunk fasteners, and general precision DIY where a clean flush finish and corrosion resistance are both required.\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 — M3. Phillips PH1 drive. 90° countersunk head angle per GB\/T 819 \/ ISO 7046 \/ DIN 965. Requires pre-tapped M3 hole or matching M3 nut. Not self-tapping.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eNote:\u003c\/strong\u003e Length is measured \u003cem\u003eincluding the head\u003c\/em\u003e (total length per GB\/T 819). Ensure your material has a properly countersunk hole at 90° for a flush fit. Pack quantity varies by length — shorter screws include more pieces per pack. See the Size \u0026amp; Pack Quantity selector for exact counts.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These A2 Stainless Phillips Countersunk Machine Screws M3 GB\/T 819\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCountersunk Flat Head (90°) — GB\/T 819 \/ ISO 7046 \/ DIN 965\u003c\/strong\u003e — Tapered head sits flush with or below the surface; eliminates snag points and delivers a clean finish on panels, woodwork, and precision assemblies. Dimensionally compatible with ISO 7046 and DIN 965.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 (304) Stainless Steel\u003c\/strong\u003e — Austenitic stainless with excellent corrosion resistance; no rust, no plating to chip or flake — suitable for indoor and light outdoor use.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePhillips PH1 Drive\u003c\/strong\u003e — Compatible with standard Phillips screwdrivers; use a well-fitting PH1 driver to avoid cam-out when driving the head flush.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e24 Lengths from 4mm to 80mm\u003c\/strong\u003e — 4mm (0.16”) to 80mm (3.15”); covers short panel-mount screws through long through-bolt assemblies for M3 countersunk fasteners in a single listing.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eVariable Pack Quantities\u003c\/strong\u003e — Pack size scales with screw length: 30 pcs for short lengths (4–6mm), down to 3–5 pcs for long lengths (55–80mm) — consistent value per pack regardless of length.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Thread Standard\u003c\/strong\u003e — Dimensionally consistent with M3 tapped holes, nuts, and threaded inserts; no compatibility guesswork for standard metric applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — A2 Stainless Phillips Countersunk Flat Head Machine Screws M3 GB\/T 819\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\u003eA2 Stainless Steel (304 \/ 18-8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric M3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM3 (3mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk Flat Head (90° angle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003ePhillips PH1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eGB\/T 819 (compatible with ISO 7046 \/ DIN 965)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e4mm (0.16”), 5mm (0.20”), 6mm (0.24”), 7mm (0.28”), 8mm (0.31”), 9mm (0.35”), 10mm (0.39”), 12mm (0.47”), 14mm (0.55”), 16mm (0.63”), 18mm (0.71”), 20mm (0.79”), 22mm (0.87”), 25mm (0.98”), 28mm (1.10”), 30mm (1.18”), 35mm (1.38”), 40mm (1.57”), 45mm (1.77”), 50mm (1.97”), 55mm (2.17”), 60mm (2.36”), 70mm (2.76”), 80mm (3.15”)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e30 pcs (4–6mm) \/ 25 pcs (7–10mm) \/ 20 pcs (12–14mm) \/ 15 pcs (16–20mm) \/ 10 pcs (22–35mm) \/ 5 pcs (40–60mm) \/ 4 pcs (70mm) \/ 3 pcs (80mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Measurement\u003c\/th\u003e\n\u003ctd\u003eIncluding head (total length per GB\/T 819)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eScrew Type\u003c\/th\u003e\n\u003ctd\u003eMachine screw (requires tapped hole or nut)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eExcellent — suitable for indoor and light outdoor use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCommon Applications\u003c\/th\u003e\n\u003ctd\u003eElectronics enclosures, panel mounting, woodworking, bracket assembly, equipment repair, precision DIY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\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?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor countersunk screws, length is measured including the head (total length per GB\/T 819). The screw should sit flush with or just below the surface when fully driven into a properly countersunk hole at 90°. Available lengths: 4mm (0.16”) to 80mm (3.15”). When in doubt, size up.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is GB\/T 819?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGB\/T 819 is the Chinese national standard for countersunk flat head machine screws with a Phillips drive and a 90° head angle. It is dimensionally compatible with ISO 7046 and DIN 965, making these screws interchangeable with metric countersunk screws to those standards. If your application specifies any of these standards, these screws are a direct match.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does A2 stainless steel mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 is the most common grade of austenitic stainless steel, equivalent to 304 or 18-8 stainless. It offers excellent corrosion resistance, is non-magnetic in most conditions, and is the standard material for general-purpose stainless fasteners in electronics, fixtures, and light outdoor use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these screws rust-proof?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless steel provides strong corrosion resistance and will not rust under normal indoor conditions or light outdoor exposure. For marine, coastal, or highly corrosive environments, A4 (316) stainless is generally recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat screwdriver do I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA Phillips PH1 screwdriver for M3. Always use a well-fitting driver to avoid cam-out, especially when driving the screw flush into a countersunk hole. A worn or undersized driver can damage the head and surrounding material.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy does the pack quantity vary by length?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003ePack quantities are set by weight and value: shorter screws (4–6mm) come in packs of 30, medium lengths (7–16mm) in 15–25 pieces, and longer screws (40–80mm) in 3–5 pieces. This keeps each pack at a consistent value regardless of screw length — you’re always getting a fair quantity for the price.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these require a tapped hole or nut?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — these are machine screws, not self-tapping. They require a pre-tapped M3 hole or a matching M3 metric nut. They will not cut their own thread into plastic, wood, or metal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003elength and pack quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3*4 mm - 30PCS","offer_id":52253604741394,"sku":"CX032-0","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3*5 mm - 30PCS","offer_id":52253604774162,"sku":"CX032-1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3*6 mm - 30PCS","offer_id":52253604806930,"sku":"CX032-2","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3*7 mm - 25PCS","offer_id":52253604839698,"sku":"CX032-3","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M3*8 mm - 25PCS","offer_id":52253604872466,"sku":"CX032-4","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M3*9 mm - 25PCS","offer_id":52253604905234,"sku":"CX032-5","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3*10 mm - 25PCS","offer_id":52253604938002,"sku":"CX032-6","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3*12 mm - 20PCS","offer_id":52253604970770,"sku":"CX032-7","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M3*14 mm - 20PCS","offer_id":52253605003538,"sku":"CX032-8","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M3*16 mm - 15PCS","offer_id":52253605036306,"sku":"CX032-9","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3*18 mm - 15PCS","offer_id":52253605069074,"sku":"CX032-10","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M3*20 mm - 15PCS","offer_id":52253605101842,"sku":"CX032-11","price":6.79,"currency_code":"USD","in_stock":true},{"title":"M3*22 mm - 10PCS","offer_id":52253605134610,"sku":"CX032-12","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3*25 mm - 10PCS","offer_id":52253605167378,"sku":"CX032-13","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3*28 mm - 10PCS","offer_id":52253605200146,"sku":"CX032-14","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3*30 mm - 10PCS","offer_id":52253605232914,"sku":"CX032-15","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3*35 mm - 10PCS","offer_id":52253605265682,"sku":"CX032-16","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M3*40 mm - 5PCS","offer_id":52253605298450,"sku":"CX032-17","price":6.32,"currency_code":"USD","in_stock":true},{"title":"M3*45 mm - 5PCS","offer_id":52253605331218,"sku":"CX032-18","price":6.38,"currency_code":"USD","in_stock":true},{"title":"M3*50 mm - 5PCS","offer_id":52253605363986,"sku":"CX032-19","price":6.46,"currency_code":"USD","in_stock":true},{"title":"M3*55 mm - 5PCS","offer_id":52253605396754,"sku":"CX032-20","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M3*60 mm - 5PCS","offer_id":52253605429522,"sku":"CX032-21","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3*70 mm - 4PCS","offer_id":52253605462290,"sku":"CX032-22","price":6.79,"currency_code":"USD","in_stock":true},{"title":"M3*80 mm - 3PCS","offer_id":52253605495058,"sku":"CX032-23","price":6.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_51efc476-603f-4d95-a4f0-b83e0f9f776b.jpg?v=1778924467","url":"https:\/\/homediyer.com\/products\/a2-stainless-phillips-countersunk-flat-head-machine-screws-m3-gb-t819-4-80mm","provider":"HomeDIYer","version":"1.0","type":"link"}