{"product_id":"m3-m4-m5-m6-a2-stainless-steel-pozi-countersunk-machine-screws","title":"M3 M4 M5 M6 A2 Stainless Steel Pozi Countersunk Machine Screws — Pozidrive Flat Head Bolts","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eA2 Stainless Steel Pozi Countersunk Machine Screws — Flush-Fit Fastening for M3 to M6 Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a protruding screw head isn't an option — whether you're fitting panels, assembling cabinetry, or mounting electrical enclosures — you need a countersunk screw that sits perfectly flush and won't corrode over time. These A2 stainless steel Pozi countersunk machine screws are built for exactly that: a clean, flat finish combined with the rust resistance that stainless steel is known for, in a Pozidrive format that reduces cam-out and driver slippage during installation.\u003c\/p\u003e\n\u003cp\u003eEach box contains machine screws with a flat (countersunk) head and Pozidrive recess, made from A2 (304) stainless steel for corrosion resistance in both indoor and outdoor environments. Available in thread diameters M3 (3mm), M4 (4mm), M5 (5mm), and M6 (6mm), with bolt lengths from 5mm (≈3\/16\") to 50mm (≈2\"), sold in boxes of 50 or 100 pieces depending on the size selected.\u003c\/p\u003e\n\u003cp\u003eThese stainless steel countersunk machine screws are well-suited for furniture and cabinetry assembly where a flush surface is required, panel and bracket mounting in electronics or electrical enclosures, and general-purpose metric fastening in workshops, marine environments, and outdoor structures where corrosion resistance matters.\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 coarse thread (M3–M6). Fits standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. Requires a Pozidrive (Pozi) screwdriver — not interchangeable with Phillips drive. Not compatible with UNC\/UNF inch-thread fasteners.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These A2 Stainless Steel Pozi Countersunk 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\u003eA2 (304) Stainless Steel\u003c\/strong\u003e — Austenitic stainless steel grade offering reliable corrosion resistance for outdoor, humid, and light marine environments, without the surface rust common to zinc-plated alternatives.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlush-Fit Countersunk Head\u003c\/strong\u003e — The flat head profile is designed to sit level with or below the workpiece surface when driven into a properly countersunk hole, making these ideal for panel mounting and cabinetry where a smooth finish is required.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePozidrive (Pozi) Recess\u003c\/strong\u003e — The Pozi drive provides better bit engagement than standard Phillips, significantly reducing cam-out under torque — a key advantage when driving screws into hardwood, metal, or dense substrates.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Available in M3, M4, M5, and M6 thread diameters with bolt lengths from 5mm to 50mm, covering the most common metric machine screw sizes for furniture, fixtures, and light engineering.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBulk Box Quantities\u003c\/strong\u003e — Sold in 50 or 100-piece boxes, making these countersunk stainless screws practical for both single-project use and ongoing workshop or production needs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMachine Screw Thread\u003c\/strong\u003e — Full machine thread (not self-tapping) designed for use with pre-tapped holes, threaded inserts, or standard metric nuts — ensuring consistent, reliable thread engagement across all sizes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Pozi Countersunk Machine Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 965 \/ equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBolt Lengths Available\u003c\/th\u003e\n\u003ctd\u003e5mm (≈3\/16\") – 50mm (≈2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eCountersunk (Flat Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Angle\u003c\/th\u003e\n\u003ctd\u003eTypically 90° — contact us to confirm for your size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003ePozidrive (Pozi \/ PZ)\u003c\/td\u003e\n\u003c\/tr\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\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e50 or 100 pieces per box (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and light marine use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eMachine thread (not self-tapping)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eDrive Tip:\u003c\/strong\u003e Always use a Pozidrive (PZ) bit — not a Phillips (PH) bit. While they look similar, a Phillips bit will not seat correctly in a Pozi recess and is likely to slip and damage the head, especially at higher torque.\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 bolt length for countersunk screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor countersunk screws, the bolt length is measured from the top of the head (which sits flush with the surface) to the tip. As a general rule, select a length equal to the thickness of the material being fastened plus enough thread engagement in the receiving material — typically at least 1.5× the thread diameter. For example, fastening a 6mm panel into a tapped hole: a 12mm or 16mm screw is generally appropriate. In inches: 10mm ≈ 3\/8\", 20mm ≈ 3\/4\", 30mm ≈ 1-3\/16\", 50mm ≈ 2\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat grade is A2 stainless steel and how strong are these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless steel (also known as 304 or 18-8 stainless) is an austenitic grade that offers good corrosion resistance and moderate tensile strength — generally around 500–700 MPa depending on size and property class. For heavy structural or high-load applications, A4 (316) or higher-grade fasteners are typically recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre A2 stainless steel screws suitable for outdoor or marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 stainless steel provides good resistance to rust and atmospheric corrosion, making it suitable for most outdoor applications and light marine environments. For prolonged saltwater or coastal exposure, A4 (316) stainless steel is generally recommended for superior chloride resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these screws use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws use the ISO metric coarse thread standard (M3, M4, M5, M6). They are compatible with standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF inch-thread fasteners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between Pozi (Pozidrive) and Phillips drive — can I use a Phillips screwdriver?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003ePozidrive (Pozi) is an improved version of the Phillips drive. It features additional ribs between the cross slots that provide better driver engagement, significantly reducing cam-out (slipping) under high torque. A Pozi (PZ) driver is required for these screws — while a Phillips driver may partially fit, it will not seat correctly and is likely to slip and damage the head, especially when driving into harder materials.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does 'countersunk' mean and when should I use it instead of a pan head screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA countersunk (flat head) screw is designed to sit flush with or below the surface of the material when driven into a countersunk hole. Use countersunk screws when a protruding head would interfere with adjacent parts, create a snag hazard, or affect the finished appearance — such as in furniture assembly, panel mounting, cabinetry, and electrical enclosures. Pan head screws are generally used where a countersunk hole is not practical or where the head needs to bear against a flat surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a special drill bit to countersink holes for these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. To achieve a flush finish, you'll need a countersink drill bit that matches the head angle of the screw — typically 90° for metric machine screws. The countersink diameter should match the head diameter of the screw size you're using. Pre-drilling a pilot hole before countersinking is generally recommended to prevent material splitting and ensure accurate positioning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your thread diameter, bolt 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":"M3 \/ 3mm \/ 5mm \/ 100PCS\/BOX","offer_id":52253705142546,"sku":"KAYFST021-1","price":3.67,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 3mm \/ 6mm \/ 100PCS\/BOX","offer_id":52253705175314,"sku":"KAYFST021-2","price":6.42,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 3mm \/ 8mm \/ 100PCS\/BOX","offer_id":52253705208082,"sku":"KAYFST021-3","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 3mm \/ 10mm \/ 100PCS\/BOX","offer_id":52253705240850,"sku":"KAYFST021-4","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 3mm \/ 12mm \/ 100PCS\/BOX","offer_id":52253705273618,"sku":"KAYFST021-5","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 3mm \/ 16mm \/ 100PCS\/BOX","offer_id":52253705306386,"sku":"KAYFST021-6","price":7.04,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 3mm \/ 30mm \/ 100PCS\/BOX","offer_id":52253705339154,"sku":"KAYFST021-7","price":8.2,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 5mm \/ 100PCS\/BOX","offer_id":52253705371922,"sku":"KAYFST021-8","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 6mm \/ 100PCS\/BOX","offer_id":52253705404690,"sku":"KAYFST021-9","price":7.04,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 8mm \/ 100PCS\/BOX","offer_id":52253705437458,"sku":"KAYFST021-10","price":7.04,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 10mm \/ 100PCS\/BOX","offer_id":52253705470226,"sku":"KAYFST021-11","price":7.34,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 12mm \/ 100PCS\/BOX","offer_id":52253705502994,"sku":"KAYFST021-12","price":7.59,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 20mm \/ 100PCS\/BOX","offer_id":52253705535762,"sku":"KAYFST021-13","price":8.51,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 30mm \/ 100PCS\/BOX","offer_id":52253705568530,"sku":"KAYFST021-14","price":9.42,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 4mm \/ 40mm \/ 100PCS\/BOX","offer_id":52253705601298,"sku":"KAYFST021-15","price":10.7,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 5mm \/ 10mm \/ 100PCS\/BOX","offer_id":52253705634066,"sku":"KAYFST021-16","price":7.89,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 5mm \/ 12mm \/ 100PCS\/BOX","offer_id":52253705666834,"sku":"KAYFST021-17","price":7.89,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 5mm \/ 16mm \/ 100PCS\/BOX","offer_id":52253705699602,"sku":"KAYFST021-18","price":7.89,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 5mm \/ 20mm \/ 100PCS\/BOX","offer_id":52253705732370,"sku":"KAYFST021-19","price":7.96,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 5mm \/ 25mm \/ 100PCS\/BOX","offer_id":52253705765138,"sku":"KAYFST021-20","price":10.7,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 5mm \/ 30mm \/ 100PCS\/BOX","offer_id":52253705797906,"sku":"KAYFST021-21","price":13.46,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 5mm \/ 50mm \/ 50PCS\/BOX","offer_id":52253705830674,"sku":"KAYFST021-22","price":11.63,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 6mm \/ 12mm \/ 100PCS\/BOX","offer_id":52253705863442,"sku":"KAYFST021-23","price":11.32,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 6mm \/ 16mm \/ 100PCS\/BOX","offer_id":52253705896210,"sku":"KAYFST021-24","price":11.94,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 6mm \/ 20mm \/ 100PCS\/BOX","offer_id":52253705928978,"sku":"KAYFST021-25","price":12.85,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 6mm \/ 30mm \/ 100PCS\/BOX","offer_id":52253705961746,"sku":"KAYFST021-26","price":16.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of5_56e385c3-531f-4614-9a5b-1251cc025066.jpg?v=1779096893","url":"https:\/\/homediyer.com\/products\/m3-m4-m5-m6-a2-stainless-steel-pozi-countersunk-machine-screws","provider":"HomeDIYer","version":"1.0","type":"link"}