{"product_id":"m3-12mm-anodised-aluminium-knurled-thumb-screws-flat-head","title":"M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM3 x 12mm Knurled Thumb Screws — Anodised Aluminium Flat Head for Tool-Free Assembly\u003c\/h2\u003e\n\u003cp\u003eIf you've ever stripped a tiny M3 screw trying to reach it with a driver in a tight enclosure, you know the frustration. These M3 x 12mm anodised aluminium knurled thumb screws are built for makers, hobbyists, and engineers who need fast, repeatable, tool-free fastening — whether you're assembling a Raspberry Pi case, closing up an RC chassis, or securing a custom panel.\u003c\/p\u003e\n\u003cp\u003eEach screw is machined from aluminium and finished with a durable anodised coating available in 10 colors: Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Brown \u0026amp; Orange. The flat head profile measures M3 in thread diameter with a 12mm (≈15\/32\") shank length. Available in pack quantities of 1, 4, 10, 20, 50, and 100 pieces to suit single-unit builds or production runs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include securing 3D printer access panels, fastening electronics enclosures where frequent access is needed, color-coding fasteners on RC car builds, and assembling DIY aluminum extrusion frames where hand-tightening is preferred over tool-driven screws.\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 M3 metric thread (ISO 68-1), pitch typically 0.5mm. Fits standard M3 nuts, threaded inserts, and tapped M3 holes. Not compatible with imperial #4-40 or UNC thread systems.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These M3 Knurled Thumb 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\u003eKnurled Grip Head\u003c\/strong\u003e — The textured knurl pattern provides enough friction for firm hand-tightening without slipping, eliminating the need for a screwdriver in tool-free fastening applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e10 Anodised Colors\u003c\/strong\u003e — Anodising integrates color into the aluminium surface rather than coating it, giving each screw a finish that resists chipping and is easy to use for color-coded assembly or visual identification on RC builds and custom panels.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eLightweight Aluminium Construction\u003c\/strong\u003e — Aluminium's low density makes these screws a practical choice for weight-sensitive builds like drone frames, RC models, and portable electronics enclosures where every gram counts.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlat Head Profile\u003c\/strong\u003e — The flat head sits flush or near-flush against the mating surface, reducing snag points on panels and enclosures and giving assemblies a cleaner finished appearance.\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 — Available from single pieces up to 100-count packs, so you can grab a few for a one-off prototype or stock up for a production batch of custom enclosures or maker kits.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eReusable Fastening\u003c\/strong\u003e — Designed for repeated installation and removal cycles, these thumb screws are well-suited for access panels, battery covers, and any assembly that needs to be opened regularly without wearing out the fastener.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — M3 Flat Head Knurled Thumb 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\u003eM3 Metric (ISO 68-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eTypically 0.5mm (metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eScrew Length\u003c\/th\u003e\n\u003ctd\u003e12mm (≈15\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFlat head, knurled grip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminium (anodised)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish \/ Color\u003c\/th\u003e\n\u003ctd\u003eAnodised — Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Brown \u0026amp; Orange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHand-tighten (no tool required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 4 \/ 10 \/ 20 \/ 50 \/ 100 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eLight-duty, hand-tightened assemblies; not for structural or high-torque joints\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Mating Hardware\u003c\/th\u003e\n\u003ctd\u003eStandard M3 nuts, M3 threaded inserts, tapped M3 holes\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\u003eNote:\u003c\/strong\u003e Head diameter and exact knurl dimensions are not listed on the packaging. If your application has tight clearance requirements, please contact us to confirm before ordering.\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 length for M3 thumb screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws are 12mm (approximately 15\/32\") in length. As a general rule, the screw length should be at least 1.5× the thread diameter for a secure hold. For M3 screws, that means a minimum engagement depth of about 4.5mm in the mating material. If your panel or bracket is thinner, consider using a nut on the back side.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are anodised aluminium thumb screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminium thumb screws are generally suited for light-duty, hand-tightened applications. They are not intended for high-torque or structural load-bearing joints. For M3 size, typical hand-tightening torque is in the range of 0.3–0.6 N·m. If higher clamping force is required, a metal tool-driven fastener is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these thumb screws be used outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAnodised aluminium offers moderate corrosion resistance, making these screws suitable for light outdoor or semi-exposed use. However, they are not recommended for prolonged submersion or highly corrosive marine environments. For harsh outdoor conditions, stainless steel fasteners are generally a better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these thumb screws use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws use the M3 metric thread standard (ISO 68-1), with a typical pitch of 0.5mm. They are compatible with standard M3 nuts, threaded inserts, and tapped holes following the metric coarse thread specification. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with imperial #4-40 or UNC thread systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a screwdriver or tool to install these?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. The knurled grip pattern on the head is specifically designed for hand-tightening without any tools. This makes them ideal for panels, enclosures, and assemblies that need to be opened and closed frequently — such as electronics project boxes, 3D printer covers, and RC battery hatches.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the anodised color chip or fade over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAnodising is an electrochemical process that integrates the color into the surface of the aluminium rather than sitting on top like paint. Under normal indoor use, the finish is generally durable and resistant to chipping. Prolonged UV exposure or abrasive contact may cause gradual fading over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I pick the right color for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eWe offer 10 anodised colors: Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Brown \u0026amp; Orange. Black and Silver are the most popular for electronics and PC builds. Bright colors like Royal Blue, Green, or Red Wine are commonly used for RC models and custom panels where visual identification matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your color and pack quantity above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3x12mm \/ Red wine \/ 1pcs","offer_id":52292991910162,"sku":"WZYGLBZSJ090871x1","price":1.35,"currency_code":"USD","in_stock":true},{"title":"M3x12mm \/ Pink \/ 1pcs","offer_id":52292991942930,"sku":"WZYGLBZSJ090872x1","price":1.35,"currency_code":"USD","in_stock":true},{"title":"M3x12mm \/ Golden \/ 1pcs","offer_id":52292991975698,"sku":"WZYGLBZSJ090873x1","price":1.35,"currency_code":"USD","in_stock":true},{"title":"M3x12mm \/ Royal blue \/ 1pcs","offer_id":52292992008466,"sku":"WZYGLBZSJ090874x1","price":1.35,"currency_code":"USD","in_stock":true},{"title":"M3x12mm \/ Sky 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