{"product_id":"m3-50mm-knurled-thumb-screw-aluminum","title":"M3 x 50mm Anodized Aluminum Knurled Thumb Screw – Hand Grip Knob Bolt","description":"\u003cstyle\u003e\n  \/* 统一前缀 hdiy-，避免样式冲突 *\/\n  .hdiy-product-wrap {\n    margin: 0;\n    padding: 0;\n  }\n  .hdiy-product-wrap h2,\n  .hdiy-product-wrap h3 {\n    margin-top: 1.5em;\n    margin-bottom: 0.5em;\n    font-weight: 600;\n  }\n  .hdiy-product-wrap p {\n    margin-bottom: 1em;\n    line-height: 1.5;\n  }\n  .hdiy-features-list {\n    list-style: none;\n    padding-left: 0;\n  }\n  .hdiy-features-list li {\n    margin-bottom: 0.75em;\n    padding-left: 1.5em;\n    position: relative;\n    line-height: 1.4;\n  }\n  .hdiy-features-list li::before {\n    content: \" \";\n    position: absolute;\n    left: 0;\n    top: 0;\n  }\n  .hdiy-table-wrapper {\n    overflow-x: auto;\n    margin: 1.2em 0;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.95rem;\n    background: #fff;\n    min-width: 300px;\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    width: 35%;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.25rem;\n    border-bottom: 1px solid #eee;\n    padding-bottom: 0.75rem;\n  }\n  .hdiy-faq-question {\n    font-weight: 700;\n    margin-bottom: 0.35rem;\n    font-size: 1rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0;\n    line-height: 1.45;\n    color: #2c2c2c;\n  }\n  @media (max-width: 640px) {\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"hdiy-product-wrap\"\u003e\n\u003c!-- Product Overview --\u003e\n\u003ch2\u003e🔧 Product Overview: M3 x 50mm Anodized Aluminum Knurled Thumb Screws – Hand Grip Knob Bolts\u003c\/h2\u003e\n\u003cp\u003eFor applications requiring a long reach and tool‑less fastening, these M3 x 50mm knurled thumb screws are an excellent choice. Machined from 6061 aluminum alloy with a durable anodized finish, they feature a round, diamond‑knurled head that provides a secure non‑slip grip for hand tightening and loosening – no screwdriver needed. The 50mm thread length (measured under the head) is ideal for thicker panels, through‑hole assemblies, or applications where extra thread engagement is required. Fully threaded with M3 coarse pitch (0.5mm). Available in a variety of vibrant anodized colors to add style to your project. Perfect for machinery, precision molds, bearing assembly, 3D printers, and custom fixtures.\u003c\/p\u003e\n\u003c!-- Key Features List --\u003e\n\u003ch2\u003e✨ Why This Long‑Reach Knurled Thumb Screw Is a Workshop Essential\u003c\/h2\u003e\n\u003cul class=\"hdiy-features-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong 50mm thread length\u003c\/strong\u003e – Ideal for thick panels, deep tapped holes, or when you need extra thread engagement for secure fastening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh‑quality 6061 aluminum alloy\u003c\/strong\u003e – Lightweight, strong, and corrosion‑resistant. Anodized finish adds durability and a professional appearance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnurled round head for tool‑less grip\u003c\/strong\u003e – Diamond knurl pattern provides excellent finger traction for hand tightening and loosening – no tools required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM3 metric thread – fully threaded\u003c\/strong\u003e – Standard coarse pitch (0.5mm). Threads run the entire 50mm length for maximum grip and compatibility with M3 nuts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmooth, burr‑free workmanship\u003c\/strong\u003e – Neat threads, even force distribution, and high‑quality materials ensure anti‑corrosion and long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibrant anodized colors\u003c\/strong\u003e – Add style and uniqueness to your project with a variety of color options (select from dropdown).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide applications\u003c\/strong\u003e – Machinery, precision molds, bearing assembly, 3D printers, camera rigs, jigs, and fixtures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Specifications Table (clean two‑column rows) --\u003e\n\u003ch2\u003e📏 Technical Specifications – M3 x 50mm Knurled Thumb Screw\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\" style=\"width: 100.083%; height: 404.29px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 21.2784px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 21.2784px;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"width: 49.9918%; height: 21.2784px;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 42.5568px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 42.5568px;\"\u003eProduct Type\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 42.5568px;\"\u003eKnurled Thumb Screws (Hand Grip Knob Bolts)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 42.5568px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 42.5568px;\"\u003eMaterial\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 42.5568px;\"\u003e6061 Aluminum Alloy (anodized)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 49.9918%;\"\u003eThread Pitch\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%;\"\u003e0.5mm (metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 21.2784px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 21.2784px;\"\u003eThread Size\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 21.2784px;\"\u003eM3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 42.5568px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 42.5568px;\"\u003eThread Length (under head)\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 42.5568px;\"\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 63.8352px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 63.8352px;\"\u003eLength Measurement\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 63.8352px;\"\u003eUnder head – from underside of head to tip (head not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 42.5568px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 42.5568px;\"\u003eHead Style\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 42.5568px;\"\u003eRound knurled head (diamond knurl)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 21.2784px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 21.2784px;\"\u003eDrive Style\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 21.2784px;\"\u003eHand grip (toolless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 42.5568px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 42.5568px;\"\u003eFinish\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 42.5568px;\"\u003eAnodized (multiple colors available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 21.2784px;\"\u003e\n\u003cth style=\"width: 49.9918%; height: 21.2784px;\"\u003eTolerance\u003c\/th\u003e\n\u003ctd style=\"width: 49.9918%; height: 21.2784px;\"\u003e±0.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- Frequently Asked Questions --\u003e\n\u003ch2\u003e❓ FAQs – M3 x 50mm Knurled Thumb Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What is the typical use for a 50mm long thumb screw?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThis long thread length is ideal for applications where you need to fasten through thick panels (e.g., 30–45mm thick), or when using a nut on the back side with extra thread engagement. It is also useful for jigs, fixtures, and custom machinery where a long reach is required.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 How is the 50mm thread length measured? Is it the total length?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThread length is measured from the underside of the knurled head to the tip of the thread. The head itself is not included. The total length (including the head) is approximately 55–60mm depending on head height.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Is this screw fully threaded? What is the thread pitch?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eYes – it is fully threaded from under the head to the tip. The thread pitch is standard M3 coarse: 0.5mm.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will the anodized color fade or wear off?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eAnodizing is an electrochemical process that bonds the color to the aluminum surface. It is durable and will not peel like paint. Under normal hand use, the color will remain vibrant for years. Heavy abrasion may wear the finish, but typical thumb screw applications are gentle.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use this screw with a nut, or is it for tapped holes only?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eIt is a standard machine screw – it works with matching M3 nuts or in pre‑tapped holes. For through‑hole applications, use a nut on the back side. The 50mm length gives you plenty of thread for nut engagement.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Are these screws magnetic? Will they affect sensitive electronics?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eAluminum is non‑magnetic, so this thumb screw will not interfere with sensitive electronics, hard drives, or magnetic sensors. It is completely safe for use near precision equipment.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3*50 \/ Royal Blue \/ 1","offer_id":52292499243282,"sku":"GLFBMWXGLBZSJ090941x1","price":9.82,"currency_code":"USD","in_stock":true},{"title":"M3*50 \/ Royal Blue \/ 5","offer_id":52292499276050,"sku":"GLFBMWXGLBZSJ090941x5","price":21.08,"currency_code":"USD","in_stock":true},{"title":"M3*50 \/ Royal Blue \/ 10","offer_id":52292499308818,"sku":"GLFBMWXGLBZSJ090941x10","price":37.58,"currency_code":"USD","in_stock":true},{"title":"M3*50 \/ Royal Blue \/ 50","offer_id":52292499341586,"sku":"GLFBMWXGLBZSJ090941x50","price":176.87,"currency_code":"USD","in_stock":true},{"title":"M3*50 \/ Royal Blue \/ 100","offer_id":52292499374354,"sku":"GLFBMWXGLBZSJ090941x100","price":351.79,"currency_code":"USD","in_stock":true},{"title":"M3*50 \/ Sky Blue \/ 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