{"product_id":"m2-stepped-thumb-screws-4-5mm","title":"M2 x 4.5mm Stepped Knurled Thumb Screws – Hand Tighten Bolts for Instrument Adjustment","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\n\u003cdiv class=\"hdiy-product-wrap\"\u003e\n  \n  \u003c!-- Product Overview --\u003e\n  \u003ch2\u003e🔧 Product Overview: M2 Thumb Screws – 4.5mm Stepped Knurled Head Bolt for Instrument Adjustment\u003c\/h2\u003e\n  \u003cp\u003eWhen you need to make precise, frequent adjustments on delicate instruments or small electronic devices, these M2 thumb screws are exactly what you're looking for. The compact 4.5mm thread length (measured under the head) is perfect for thin panels, battery compartments, and safety covers. The stepped knurled head provides a comfortable, non‑slip grip for hand tightening – no tools required. Made from durable steel, these screws allow you to control tightening force accurately, preventing over‑tightening and damage to sensitive components. Ideal for musical instruments, test equipment, and any application where components need regular removal and reinstallation.\u003c\/p\u003e\n  \n  \u003c!-- Key Features List --\u003e\n  \u003ch2\u003e✨ Why These Small Thumb Screws Are Perfect for Precision Work\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features-list\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompact M2 thread size\u003c\/strong\u003e – Ideal for small electronics, instruments, and tight spaces where standard screws won't fit.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e4.5mm thread length (under head)\u003c\/strong\u003e – Designed for thin panels, covers, and battery compartments. Provides just enough engagement without bottoming out.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStepped knurled head\u003c\/strong\u003e – The stepped design gives you a natural finger stop and extra grip for easy hand tightening and loosening.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTool‑less operation\u003c\/strong\u003e – No screwdriver needed. Perfect for frequent access to battery compartments, safety covers, and adjustable panels.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAccurate torque control\u003c\/strong\u003e – Hand tightening allows you to feel the resistance and avoid over‑tightening, preventing stripped threads or damaged components.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e – Fasten panels, wiring covers, safety guards, battery compartments, and any parts that require regular removal and reinstallation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePortable and easy to use\u003c\/strong\u003e – Small, lightweight, and ready to use anywhere – no power tools required.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003c!-- Specifications Table --\u003e\n  \u003ch2\u003e📏 Technical Specifications – M2 Thumb Screws (4.5mm Thread Length)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrapper\"\u003e\n    \u003ctable class=\"hdiy-specs-table\"\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eKnurled Thumb Screws (Stepped Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size (Diameter)\u003c\/th\u003e\n\u003ctd\u003eM2\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e0.4mm (metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Length (under head)\u003c\/th\u003e\n\u003ctd\u003e4.5mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Measurement\u003c\/th\u003e\n\u003ctd\u003eUnder head – from underside of stepped head to tip (head not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eStepped knurled cylinder (diamond knurl)\n        \u003c\/td\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHand grip (toolless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n        \u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eAs shown (steel, may be natural or coated depending on batch)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \n  \u003c!-- Frequently Asked Questions --\u003e\n  \u003ch2\u003e❓ FAQs – M2 Stepped Thumb Screws\u003c\/h2\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What are the typical applications for a 4.5mm long M2 thumb screw?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eThese screws are ideal for securing thin panels (1‑2mm thick), battery compartment covers, safety covers on instruments, small electronic device enclosures, and any component that requires frequent hand access. They are commonly used in musical instruments, test equipment, and hobby electronics.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 How is the 4.5mm 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 stepped head to the tip. The head itself is not included. The total length (including head) is approximately 6‑7mm depending on head height. This measurement ensures you have the correct thread engagement for thin panels.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Are these screws fully threaded? What is the thread pitch?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eYes – they are fully threaded from under the head to the tip. The thread pitch is standard M2 coarse: 0.4mm.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use these screws with nuts, or are they for tapped holes only?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eThese are standard machine screws – they work with matching M2 nuts or in pre‑tapped holes. For through‑hole applications with thin panels, a nut can be used on the back side. However, given the short 4.5mm length, nuts are only suitable for very thin materials.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will steel screws rust?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eSteel can rust if exposed to moisture. For indoor instrument and electronics applications, rust is minimal. For humid or outdoor use, consider stainless steel or coated versions. These screws are best suited for dry, indoor environments.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What is the advantage of a stepped knurled head over a standard knurled head?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eThe stepped design provides a distinct finger stop – your finger naturally rests against the step, giving you better grip and control. It also adds a visual and tactile reference point, making it easier to find the screw by touch in low‑light conditions.\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M5*10 \/ 1","offer_id":52292595450130,"sku":"GLFBQYF2024JINGLONGWJ1746x1","price":7.15,"currency_code":"USD","in_stock":true},{"title":"M5*10 \/ 3","offer_id":52292595482898,"sku":"GLFBQYF2024JINGLONGWJ1746x3","price":9.87,"currency_code":"USD","in_stock":true},{"title":"M5*10 \/ 5","offer_id":52292595515666,"sku":"GLFBQYF2024JINGLONGWJ1746x5","price":12.58,"currency_code":"USD","in_stock":true},{"title":"M5*10 \/ 8","offer_id":52292595548434,"sku":"GLFBQYF2024JINGLONGWJ1746x8","price":17.52,"currency_code":"USD","in_stock":true},{"title":"M5*10 \/ 10","offer_id":52292595581202,"sku":"GLFBQYF2024JINGLONGWJ1746x10","price":21.38,"currency_code":"USD","in_stock":true},{"title":"M5*12 \/ 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