{"product_id":"m3-40mm-aluminium-knurled-thumb-screw","title":"M3 x 40mm Aluminium Knurled Thumb Screw – Long Reach Hand Grip Knob Bolt (Anodised Finish)","description":"\u003c!-- Part 1: Product Description HTML for Shopify --\u003e\n\u003cdiv class=\"hdiy-aluminum-thumb-40mm\"\u003e\n  \u003c!-- Product Overview Section --\u003e\n  \u003ch2\u003e🔘 M3 x 40mm Aluminium Knurled Thumb Screw – Anodised Hand Grip Knob Bolt for Machinery \u0026amp; Precision Moulds\u003c\/h2\u003e\n  \u003cp\u003eYou’re setting up a jig, adjusting a mould, or working on a bearing assembly – and you need a thumbscrew that reaches deep into the equipment without tools. This M3 x 40mm aluminium knurled thumb screw gives you a long, fully threaded stud (40mm under head) combined with a comfortable, diamond‑knurled head. Made from 6061 aluminium with a durable anodised finish, it’s lightweight, corrosion‑resistant, and won’t strip or slip. Perfect for machinery adjustments, precision moulds, jigs, and any application where a long‑reach, tool‑less hand grip is required.\u003c\/p\u003e\n\n  \u003c!-- Features Section --\u003e\n  \u003ch2\u003e✨ Key Features – M3 x 40mm Aluminium Thumb Screw\u003c\/h2\u003e\n  \u003cul class=\"hdiy-feature-list\"\u003e\n    \u003cli\u003e🔘 \u003cstrong\u003eKnurled round head\u003c\/strong\u003e – Fine diamond knurling for a secure, non‑slip fingertip grip – no tools needed.\u003c\/li\u003e\n    \u003cli\u003e📏 \u003cstrong\u003e40mm fully threaded stud (under head)\u003c\/strong\u003e – Long reach for thick panels or deep recesses. Fully threaded for maximum grip.\u003c\/li\u003e\n    \u003cli\u003e⚖️ \u003cstrong\u003eLightweight 6061 aluminium\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 various colours (contact us for options).\u003c\/li\u003e\n    \u003cli\u003e🛡️ \u003cstrong\u003eM3 metric thread (3mm diameter, 0.5mm pitch)\u003c\/strong\u003e – Standard size for electronics, small machinery, and precision instruments.\u003c\/li\u003e\n    \u003cli\u003e✨ \u003cstrong\u003eHigh quality workmanship\u003c\/strong\u003e – Smooth, burr‑free surface, even threads, uniform force – no slipping or stripping teeth.\u003c\/li\u003e\n    \u003cli\u003e🔧 \u003cstrong\u003eWidely used\u003c\/strong\u003e – Machinery, precision moulds, bearing assembly, jigs, fixtures, and industrial equipment.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- Specifications Table --\u003e\n  \u003ch2\u003e📏 Specifications – M3 x 40mm Knurled Thumb Screw (Aluminium)\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, under head) *\u003c\/th\u003e\n          \u003cth\u003eHead Style\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\"\u003e40 mm\u003c\/td\u003e\n          \u003ctd class=\"head-type\"\u003eRound knurled\u003c\/td\u003e\n          \u003ctd class=\"head-dia\"\u003e~8‑10 mm\u003c\/td\u003e\n          \u003ctd class=\"head-h\"\u003e~5‑7 mm\u003c\/td\u003e\n          \u003ctd class=\"material\"\u003e6061 aluminium \/ 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* Length measured from underside of head to tip. Fully threaded. Colour may vary slightly due to photography and lighting – actual anodised colour may differ.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Application \u0026 Quality --\u003e\n  \u003ch2\u003e🛠️ Where to Use This Long‑Reach 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\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\"\u003eAdjustment screws on deep frames, access panels, tool‑less clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003ePrecision moulds\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eQuick‑release fasteners, alignment pins, deep‑throat clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eBearing assembly \u0026amp; jigs\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eAdjustable stops, deep‑set screws, fixture handles\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eDIY \u0026amp; prototyping\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eCustom fixtures, 3D printer bed leveling (long reach), camera rigs\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ Section – all expanded --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions – M3 x 40mm 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\"\u003eThe length (40mm) is measured from the underside of the head (where the knurling meets the shaft) to the tip of the threaded stud. The head itself is NOT included. This 40mm stud is designed for applications that require a long reach through thick panels or into deep recesses.\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? Can I use it with a nut?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eYes – it is fully threaded from under the head to the tip. If you need to fasten through a plain hole, use an M3 metric nut (0.5mm pitch). For pre‑tapped M3 holes, no nut is needed.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e3. What colours are 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 a range of anodised colours (black, silver, red, blue, gold, green, etc.). Actual colour may vary slightly between batches or due to monitor calibration – this is normal. 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\u003e4. Will the anodised finish wear off? Is it durable?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eAnodising is a hard, electrochemical finish that bonds to the aluminium. It resists scratches and fading far better than paint. Normal hand use will not remove the colour.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e5. Can I use this screw outdoors? Will it rust?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eAluminium naturally forms a protective oxide layer, and anodising adds extra corrosion resistance. It is suitable 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\u003e6. Can I get other lengths or custom colours?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eYes – we offer custom lengths and anodised colours. Please contact us with your requirements.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n  .hdiy-aluminum-thumb-40mm {\n    max-width: 100%;\n    margin: 0;\n    padding: 0;\n    color: #1a1a1a;\n    line-height: 1.5;\n  }\n  .hdiy-aluminum-thumb-40mm 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-aluminum-thumb-40mm h2:first-of-type {\n    margin-top: 0;\n  }\n  .hdiy-aluminum-thumb-40mm 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: 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