{"product_id":"m4-m5-m6-blue-zinc-phillips-flat-head-machine-screws","title":"M4 M5 M6 Blue Zinc Plated Phillips Flat Head Machine Screws | Countersunk Bolts","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBlue Zinc Phillips Countersunk Machine Screws — Flush Fit for Clean, Professional Assemblies\u003c\/h2\u003e\n\u003cp\u003eWhen a protruding screw head gets in the way of a clean finish, you need a flat head machine screw that sits perfectly flush. Whether you're a woodworker building cabinet frames, a maker assembling electronics enclosures, or a maintenance tech fastening metal brackets, these \u003cstrong\u003eblue zinc plated Phillips countersunk machine screws\u003c\/strong\u003e deliver a reliable, flush-mount connection without the bulk.\u003c\/p\u003e\n\u003cp\u003eEach pack contains machine screws in your selected size and quantity — M4, M5, or M6 diameter — with lengths ranging from 8mm (5\/16\") to 40mm (1‑9\/16\"). The screws are made from carbon steel with a blue zinc electroplated finish that provides a distinctive metallic-blue appearance and moderate corrosion resistance. Packing quantities are 200 pcs (M4), 100 pcs (M5), or 50 pcs (M6) depending on the size selected.\u003c\/p\u003e\n\u003cp\u003eThese flat head machine screws are well suited for \u003cstrong\u003efurniture and cabinetry assembly\u003c\/strong\u003e where a flush surface is required, \u003cstrong\u003eelectronics and enclosure fabrication\u003c\/strong\u003e where panel-mount screws must not protrude, and \u003cstrong\u003elight machinery and bracket fastening\u003c\/strong\u003e in workshops and production environments. The Phillips drive makes them compatible with standard power drivers for fast installation.\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 — M4 (0.7mm pitch), M5 (0.8mm pitch), M6 (1.0mm pitch). Fits standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. Phillips PH2 driver recommended for M4\/M5; PH2 or PH3 for M6.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Blue Zinc Phillips 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\u003eFlush-Mount Flat Head Design\u003c\/strong\u003e — The countersunk head tapers to sit flush with or below the material surface, ideal for \u003cem\u003eflat head machine screw\u003c\/em\u003e applications in panels, brackets, and enclosures.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlue Zinc Electroplated Finish\u003c\/strong\u003e — The electroplating process bonds a zinc layer to the carbon steel base, offering moderate rust resistance for indoor and sheltered-use fasteners.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePhillips Cross Drive\u003c\/strong\u003e — Compatible with standard PH2\/PH3 bits and power drivers, reducing installation time on bulk fastening jobs like \u003cem\u003ePhillips countersunk bolts for metal\u003c\/em\u003e assemblies.\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 M4, M5, and M6 diameters with lengths from 8mm (5\/16\") to 40mm (1‑9\/16\"), covering most light-to-medium duty \u003cem\u003emetric machine screw\u003c\/em\u003e applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBulk Pack Value\u003c\/strong\u003e — Sold in packs of 50, 100, or 200 pieces depending on size, making these practical for production runs, workshop stock, and \u003cem\u003ebulk machine screw\u003c\/em\u003e restocking.\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 Compatibility\u003c\/strong\u003e — Follows ISO 68-1 coarse thread standards, ensuring consistent fit with metric nuts, threaded inserts, and pre-tapped holes used in \u003cem\u003emetric fastener\u003c\/em\u003e assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Phillips 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\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003ePhillips Countersunk (Flat Head) Machine Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003ePhillips (Cross) — PH2 \/ PH3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk \/ Flat Head (flush-mount)\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlue Zinc Electroplated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (ISO 68-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM4: 0.7mm | M5: 0.8mm | M6: 1.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (5\/16\") to 40mm (1‑9\/16\") — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003eM4: 200 pcs | M5: 100 pcs | M6: 50 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eModerate — suitable for indoor \/ sheltered use\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\u003eHeads up:\u003c\/strong\u003e Blue zinc plating is designed for indoor and light sheltered use. For outdoor, marine, or high-humidity environments, stainless steel fasteners are generally recommended. Contact us if you need corrosion-resistant alternatives.\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 for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA general rule of thumb is that the screw should penetrate the base material by at least the diameter of the screw. For example, an M5 screw (5mm diameter) should typically embed at least 5mm into the receiving material. Available lengths in this listing range from 8mm (5\/16\") to 40mm (1‑9\/16\") — choose based on your combined material thickness plus the required thread engagement depth.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are blue zinc plated machine screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws are generally manufactured from carbon steel with a blue zinc electroplating finish. Carbon steel machine screws typically meet property class 4.8 or 8.8 strength grades depending on the specific production batch. For structural or load-bearing applications, please contact us to confirm the grade before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these screws be used outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBlue zinc plating provides moderate corrosion resistance suitable for indoor and light-duty sheltered applications. For prolonged outdoor exposure, high humidity, or direct water contact, stainless steel fasteners are generally recommended. Contact us if you need outdoor-rated alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these machine screws use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws follow the ISO metric coarse thread standard. M4 has a 0.7mm pitch, M5 has a 0.8mm pitch, and M6 has a 1.0mm pitch. They are compatible with standard metric nuts, threaded inserts, and tapped holes following ISO 68-1 specifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat driver bit do I need for these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws use a Phillips (cross) drive head. For M4 and M5, a PH2 bit is typically used. For M6, a PH2 or PH3 bit is generally appropriate depending on head size. Always use a properly sized bit to avoid cam-out and head damage during installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does 'countersunk' or 'flat head' mean, and when should I use it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA countersunk (flat head) screw has a tapered underside that sits flush with or below the surface of the material when driven into a countersunk hole. This is ideal when a smooth, flush finish is required — such as in cabinetry, electronics enclosures, metal brackets, and furniture assembly where a protruding head would interfere.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many screws come in each pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003ePacking quantity varies by diameter: M4 screws are available in 200-piece packs, M5 screws in 100-piece packs, and M6 screws in 50-piece packs. Select your preferred size and quantity combination from the variant options above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4*8 \/ 200pcs","offer_id":52285157343506,"sku":"LFL2024TENGLUOWJ05469x200","price":34.79,"currency_code":"USD","in_stock":true},{"title":"M4*10 \/ 200pcs","offer_id":52285157376274,"sku":"LFL2024TENGLUOWJ05470x200","price":38.6,"currency_code":"USD","in_stock":true},{"title":"M4*12 \/ 200pcs","offer_id":52285157409042,"sku":"LFL2024TENGLUOWJ05471x200","price":42.3,"currency_code":"USD","in_stock":true},{"title":"M4*16 \/ 200pcs","offer_id":52285157441810,"sku":"LFL2024TENGLUOWJ05472x200","price":49.48,"currency_code":"USD","in_stock":true},{"title":"M4*20 \/ 200pcs","offer_id":52285157474578,"sku":"LFL2024TENGLUOWJ05473x200","price":56.55,"currency_code":"USD","in_stock":true},{"title":"M4*25 \/ 200pcs","offer_id":52285157507346,"sku":"LFL2024TENGLUOWJ05474x200","price":65.8,"currency_code":"USD","in_stock":true},{"title":"M4*30 \/ 200pcs","offer_id":52285157540114,"sku":"LFL2024TENGLUOWJ05475x200","price":75.59,"currency_code":"USD","in_stock":true},{"title":"M4*35 \/ 200pcs","offer_id":52285157572882,"sku":"LFL2024TENGLUOWJ05476x200","price":85.38,"currency_code":"USD","in_stock":true},{"title":"M4*40 \/ 200pcs","offer_id":52285157605650,"sku":"LFL2024TENGLUOWJ05477x200","price":95.99,"currency_code":"USD","in_stock":true},{"title":"M5*10 \/ 100pcs","offer_id":52285157638418,"sku":"LFL2024TENGLUOWJ05478x100","price":33.59,"currency_code":"USD","in_stock":true},{"title":"M5*12 \/ 100pcs","offer_id":52285157671186,"sku":"LFL2024TENGLUOWJ05479x100","price":36.42,"currency_code":"USD","in_stock":true},{"title":"M5*16 \/ 100pcs","offer_id":52285157703954,"sku":"LFL2024TENGLUOWJ05480x100","price":41.75,"currency_code":"USD","in_stock":true},{"title":"M5*20 \/ 100pcs","offer_id":52285157736722,"sku":"LFL2024TENGLUOWJ05481x100","price":47.74,"currency_code":"USD","in_stock":true},{"title":"M5*25 \/ 100pcs","offer_id":52285157769490,"sku":"LFL2024TENGLUOWJ05482x100","price":54.92,"currency_code":"USD","in_stock":true},{"title":"M5*30 \/ 100pcs","offer_id":52285157802258,"sku":"LFL2024TENGLUOWJ05483x100","price":62.97,"currency_code":"USD","in_stock":true},{"title":"M5*35 \/ 100pcs","offer_id":52285157835026,"sku":"LFL2024TENGLUOWJ05484x100","price":70.96,"currency_code":"USD","in_stock":true},{"title":"M5*40 \/ 100pcs","offer_id":52285157867794,"sku":"LFL2024TENGLUOWJ05485x100","price":78.31,"currency_code":"USD","in_stock":true},{"title":"M6*12 \/ 50pcs","offer_id":52285157900562,"sku":"LFL2024TENGLUOWJ05486x50","price":28.15,"currency_code":"USD","in_stock":true},{"title":"M6*16 \/ 50pcs","offer_id":52285157933330,"sku":"LFL2024TENGLUOWJ05487x50","price":32.23,"currency_code":"USD","in_stock":true},{"title":"M6*20 \/ 50pcs","offer_id":52285157966098,"sku":"LFL2024TENGLUOWJ05488x50","price":36.31,"currency_code":"USD","in_stock":true},{"title":"M6*25 \/ 50pcs","offer_id":52285157998866,"sku":"LFL2024TENGLUOWJ05489x50","price":41.21,"currency_code":"USD","in_stock":true},{"title":"M6*30 \/ 50pcs","offer_id":52285158031634,"sku":"LFL2024TENGLUOWJ05490x50","price":46.76,"currency_code":"USD","in_stock":true},{"title":"M6*35 \/ 50pcs","offer_id":52285158064402,"sku":"LFL2024TENGLUOWJ05491x50","price":52.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_5d136730-4068-4bff-b5e8-49f99fe29d69.jpg?v=1780503188","url":"https:\/\/homediyer.com\/products\/m4-m5-m6-blue-zinc-phillips-flat-head-machine-screws","provider":"HomeDIYer","version":"1.0","type":"link"}