{"product_id":"m3-20mm-aluminum-knurled-thumb-screw","title":"M3 x 20mm Aluminum Alloy Knurled Thumb Screw – Hand Grip Knob Bolt, Anodised Finish","description":"\u003c!-- Part 1: Product Description HTML for Shopify --\u003e\n\u003cdiv class=\"hdiy-knurled-thumb-m3\"\u003e\n\u003c!-- Product Overview Section --\u003e\n\u003ch2\u003e🔘 M3 x 20mm Aluminum Alloy Knurled Thumb Screw – Hand Grip Knob Bolt, Anodised Finish\u003c\/h2\u003e\n\u003cp\u003eYou need a reliable, lightweight thumb screw for a quick‑release panel, a jig, or a piece of test equipment – and you don’t want to search for a screwdriver every time. This M3 x 20mm knurled thumb screw gives you a comfortable, diamond‑knurled aluminium head that you can tighten and loosen by hand. Made from 6061 aluminium alloy with an anodised finish, it’s corrosion‑resistant, non‑magnetic, and much lighter than steel. The 20mm thread length (under head) is fully threaded, providing a secure hold in tapped holes or with a matching M3 nut. Ideal for machinery, precision moulds, bearing assemblies, and any DIY application where tool‑less adjustment is a bonus.\u003c\/p\u003e\n\u003c!-- Features Section --\u003e\n\u003ch2\u003e✨ Key Features – M3 x 20mm Knurled Aluminium Thumb Screw\u003c\/h2\u003e\n\u003cul class=\"hdiy-feature-list\"\u003e\n\u003cli\u003e🔘 \u003cstrong\u003eKnurled round head\u003c\/strong\u003e – Diamond pattern provides excellent fingertip grip, even with oily or gloved hands.\u003c\/li\u003e\n\u003cli\u003e⚖️ \u003cstrong\u003eLightweight 6061 aluminium alloy\u003c\/strong\u003e – About 1\/3 the weight of steel. Non‑magnetic and thermally conductive.\u003c\/li\u003e\n\u003cli\u003e🎨 \u003cstrong\u003eAnodised finish\u003c\/strong\u003e – Corrosion‑resistant, durable, and available in multiple colours (actual colour may vary slightly due to photography).\u003c\/li\u003e\n\u003cli\u003e📐\u003cbr\u003e\u003cstrong\u003eTool‑less operation\u003c\/strong\u003e – No screwdrivers, hex keys, or wrenches needed. Perfect for frequent adjustments.\u003c\/li\u003e\n\u003cli\u003e📏 \u003cstrong\u003eM3 metric thread (3mm diameter, 0.5mm pitch)\u003c\/strong\u003e – One of the most common sizes for electronics, machinery, and DIY.\u003c\/li\u003e\n\u003cli\u003e📐 \u003cstrong\u003e20mm thread length (under head)\u003c\/strong\u003e – Fully threaded from under the head to the tip for maximum grip in blind holes or with a nut.\u003c\/li\u003e\n\u003cli\u003e🔧 \u003cstrong\u003eWidely used\u003c\/strong\u003e – Machinery, precision moulds, bearing assembly, 3D printers, camera rigs, and workshop fixtures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Specifications Table --\u003e\n\u003ch2\u003e📏 Specifications – M3 x 20mm Knurled Thumb Screw\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\" style=\"overflow-x: auto;\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter (M)\u003c\/th\u003e\n\u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n\u003cth\u003eThread Length (mm)\u003c\/th\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003cth\u003eHead Diameter (approx.)\u003c\/th\u003e\n\u003cth\u003eHead Height (approx.)\u003c\/th\u003e\n\u003cth\u003eMaterial \/ Finish\u003c\/th\u003e\n\u003cth\u003eTolerance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"dia\"\u003eM3\u003c\/td\u003e\n\u003ctd class=\"pitch\"\u003e0.5\u003c\/td\u003e\n\u003ctd class=\"len\"\u003e20 mm (under head)\u003c\/td\u003e\n\u003ctd class=\"head-type\"\u003eRound knurled (hand grip)\u003c\/td\u003e\n\u003ctd class=\"head-dia\"\u003e~7‑8 mm\u003c\/td\u003e\n\u003ctd class=\"head-h\"\u003e~4‑5 mm\u003c\/td\u003e\n\u003ctd class=\"material\"\u003e6061 aluminium alloy \/ Anodised\u003c\/td\u003e\n\u003ctd class=\"tolerance\"\u003e±0.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"hdiy-note\" style=\"font-size: 0.85rem; margin-top: 0.5rem;\"\u003e* Thread length measured from underside of head to tip. Fully threaded. Slight colour differences may occur due to photography and monitor settings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Application \u0026 Use Guide --\u003e\n\u003ch2\u003e🛠️ Typical Applications for M3 Thumb Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\" style=\"overflow-x: auto;\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eTypical Use\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eMachinery \u0026amp; equipment\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eQuick‑release access panels, adjustment levers, tool‑less clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003ePrecision moulds \u0026amp; bearing assembly\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eFixture stops, alignment blocks, temporary fastening\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003e3D printers \u0026amp; CNC\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eBed leveling knobs, spool holders, enclosure thumbscrews\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eElectronics enclosures\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eBattery compartments, PCB covers, test equipment panels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- FAQ Section – all expanded --\u003e\n\u003ch2\u003e❓ Frequently Asked Questions – M3 Aluminium Thumb Screw\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e1. How do I measure the length of this thumb screw?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eLength is measured from the underside of the head (where the knurling ends) to the tip of the threaded shaft. The head itself is NOT included. This screw has a 20mm threaded shaft under the head, which is ideal for panels approximately 8‑16mm thick (plus a nut if needed).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e2. Is the screw fully threaded? What about the tip?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eYes – it is fully threaded from under the head to the tip, giving you maximum grip in tapped holes or when using a nut.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e3. Will anodised aluminium rust? Can I use this outdoors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eThe anodised finish provides good corrosion resistance for indoor and light outdoor use. For continuous saltwater or harsh chemical environments, consider stainless steel thumb screws.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e4. Do I need a nut or washer with this screw?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eIf your equipment has a tapped M3 hole, no nut is needed. For plain holes, use a standard M3 metric nut. A flat washer is optional for load distribution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e5. Are there other colours available? The photo shows a certain colour – will mine match exactly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eWe offer anodised colours on request. Due to photography and monitor calibration, slight colour differences may occur. Please contact us for specific colour availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e6. Is this screw strong enough for load‑bearing applications?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eAluminium has lower tensile strength than steel. This thumb screw is designed for light‑duty fastening (enclosures, jigs, adjustment knobs). For heavy loads, use a steel thumb screw.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e\n  .hdiy-knurled-thumb-m3 {\n    max-width: 100%;\n    margin: 0;\n    padding: 0;\n    color: #1a1a1a;\n    line-height: 1.5;\n  }\n  .hdiy-knurled-thumb-m3 h2 {\n    font-size: 1.75rem;\n    margin: 1.5rem 0 0.75rem 0;\n    font-weight: 600;\n    border-bottom: 2px solid #eaeaea;\n    padding-bottom: 0.5rem;\n  }\n  .hdiy-knurled-thumb-m3 h2:first-of-type {\n    margin-top: 0;\n  }\n  .hdiy-knurled-thumb-m3 p {\n    margin-bottom: 1rem;\n    font-size: 1rem;\n  }\n  .hdiy-feature-list {\n    list-style: none;\n    padding-left: 0;\n    margin: 1rem 0;\n  }\n  .hdiy-feature-list li {\n    margin-bottom: 0.75rem;\n    padding-left: 0.25rem;\n    font-size: 1rem;\n    display: flex;\n    align-items: flex-start;\n    gap: 0.5rem;\n  }\n  .hdiy-feature-list li strong {\n    font-weight: 600;\n  }\n  .hdiy-table-wrapper {\n    margin: 1.25rem 0;\n    border: 1px solid #e2e2e2;\n    border-radius: 8px;\n    background: #fff;\n    overflow-x: auto;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.9rem;\n    min-width: 550px;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n  }\n  .hdiy-note {\n    font-style: italic;\n    color: #555;\n  }\n  .hdiy-faq {\n    margin: 1.5rem 0;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.5rem;\n    padding-bottom: 0.5rem;\n    border-bottom: 1px solid #ececec;\n  }\n  .hdiy-faq-question {\n    margin-bottom: 0.25rem;\n    font-size: 1.05rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0.25rem;\n    color: #2c2c2c;\n  }\n  @media (max-width: 768px) {\n    .hdiy-knurled-thumb-m3 h2 {\n      font-size: 1.5rem;\n    }\n    .hdiy-specs-table th,\n    .hdiy-specs-table td 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