{"product_id":"m2-5-7-5mm-thumb-screw-for-caliper","title":"M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper","description":"\u003c!-- Part 1: Product Description HTML for Shopify --\u003e\n\u003cdiv class=\"hdiy-vernier-thumb-screw\"\u003e\n  \u003c!-- Product Overview Section --\u003e\n  \u003ch2\u003e🔩 M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Precision Knob Bolt for Vernier Caliper \u0026amp; Measuring Tools\u003c\/h2\u003e\n  \u003cp\u003eYou’ve got a vernier caliper with a loose or missing locking screw – and a standard thumb screw is either too long, the wrong thread, or made of soft material that strips. This M2.5 x 7.5mm knurled thumb screw is precision‑machined from stainless steel to fit many digital and dial calipers. The diamond‑knurled head gives you a secure grip for hand tightening, and the stainless steel construction resists rust and wear – critical for measuring tools that live in workshops or labs. Use it as a direct replacement for the original locking screw, or keep a spare in your tool kit.\u003c\/p\u003e\n\n  \u003c!-- Features Section --\u003e\n  \u003ch2\u003e✨ Key Features – M2.5 x 7.5mm Knurled Thumb Screw\u003c\/h2\u003e\n  \u003cul class=\"hdiy-feature-list\"\u003e\n    \u003cli\u003e🔘 \u003cstrong\u003eKnurled knob head\u003c\/strong\u003e – Fine diamond knurling provides excellent fingertip grip for tool‑less locking and adjustment.\u003c\/li\u003e\n    \u003cli\u003e🛡️ \u003cstrong\u003eStainless steel construction\u003c\/strong\u003e – Corrosion‑resistant, durable, and non‑magnetic. Ideal for workshop and measuring instruments.\u003c\/li\u003e\n    \u003cli\u003e📏 \u003cstrong\u003eM2.5 metric thread (2.5mm diameter, 0.45mm pitch)\u003c\/strong\u003e – Common size for vernier caliper locking screws and small precision instruments.\u003c\/li\u003e\n    \u003cli\u003e📐 \u003cstrong\u003e7.5mm thread length (under head)\u003c\/strong\u003e – Designed to match the typical thickness of caliper jaw locking mechanisms. Fully threaded.\u003c\/li\u003e\n    \u003cli\u003e🛠️ \u003cstrong\u003eDirect replacement for many calipers\u003c\/strong\u003e – Fits most standard vernier, dial, and digital calipers (check original screw size before ordering).\u003c\/li\u003e\n    \u003cli\u003e🔧 \u003cstrong\u003eVersatile use\u003c\/strong\u003e – Vernier calipers, micrometers, small fixtures, hobby tools, and any device requiring a small hand‑tightened locking screw.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- Specifications Table --\u003e\n  \u003ch2\u003e📏 Specifications – M2.5 x 7.5mm Stainless Steel 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\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\"\u003eM2.5\u003c\/td\u003e\n          \u003ctd class=\"pitch\"\u003e0.45\u003c\/td\u003e\n          \u003ctd class=\"len\"\u003e7.5 mm (under head)\u003c\/td\u003e\n          \u003ctd class=\"head-type\"\u003eKnurled cylinder \/ knob\u003c\/td\u003e\n          \u003ctd class=\"head-dia\"\u003e~5‑6 mm\u003c\/td\u003e\n          \u003ctd class=\"head-h\"\u003e~3‑4 mm\u003c\/td\u003e\n          \u003ctd class=\"material\"\u003eStainless steel\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. Head dimensions are approximate – may vary slightly by manufacturer.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Application \u0026 Use Guide --\u003e\n  \u003ch2\u003e🛠️ Compatible Tools \u0026amp; Applications\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\u003eInstrument \/ Use\u003c\/th\u003e\n\u003cth\u003eDetails\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\"\u003eVernier calipers (digital\/dial)\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eReplaces the locking screw on most 150mm\/200mm calipers (Mitutoyo, Moore \u0026amp; Wright, etc.). Check original thread size first.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eMicrometers\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eSome small micrometers use M2.5 locking screws – verify before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eWorkshop fixtures \u0026amp; jigs\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eTool‑less clamping, adjustable stops, and quick‑release mechanisms.\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 – Vernier Caliper 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. Will this screw fit my specific vernier caliper?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eMany standard vernier, dial, and digital calipers use an M2.5 x 0.45mm locking screw with a thread length of 6–8mm. This 7.5mm version is a common replacement. However, we strongly recommend measuring your original screw’s thread diameter, pitch, and length before ordering. If uncertain, contact us with your caliper model.\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 does “thread length under head” mean?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eYes – it is fully threaded from the underside of the head to the tip. The 7.5mm is the length of the threaded shaft, not including the knurled head. This ensures maximum grip in the caliper’s threaded hole.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e3. Will stainless steel rust? Is it safe for workshop use?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eStainless steel (likely 303 or 304 grade) offers excellent corrosion resistance. It will not rust in normal workshop conditions, even with occasional exposure to oil or moisture. Perfect for long‑term use on measuring tools.\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\"\u003eNo – this screw is designed to thread directly into the caliper’s existing threaded hole. No nut or washer is required. Simply screw it in until it locks the jaw.\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 for other applications besides calipers?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eYes – it works for any application requiring a small M2.5 knurled thumb screw, such as camera accessories, small jigs, or instrument adjustments. Ensure the thread length matches your needs.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e6. What head style does it have? Is it comfortable to turn by hand?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eThe head is a cylindrical knurled knob with a diamond or straight knurl pattern. It is designed for comfortable fingertip gripping, even with light oil on your hands.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n  .hdiy-vernier-thumb-screw {\n    max-width: 100%;\n    margin: 0;\n    padding: 0;\n    color: #1a1a1a;\n    line-height: 1.5;\n  }\n  .hdiy-vernier-thumb-screw 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-vernier-thumb-screw h2:first-of-type {\n    margin-top: 0;\n  }\n  .hdiy-vernier-thumb-screw 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: 500px;\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-vernier-thumb-screw h2 {\n      font-size: 1.5rem;\n    }\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n      font-size: 0.85rem;\n    }\n  }\n\u003c\/style\u003e","brand":"HomeDIYer","offers":[{"title":"1","offer_id":52292338680082,"sku":"PHJ209-0","price":1.96,"currency_code":"USD","in_stock":true},{"title":"5","offer_id":52292338712850,"sku":"PHJ209-1","price":2.71,"currency_code":"USD","in_stock":true},{"title":"10","offer_id":52292338745618,"sku":"PHJ209-2","price":3.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of6_b563ea5c-779d-481b-951d-747c2cc00d75.jpg?v=1780502467","url":"https:\/\/homediyer.com\/products\/m2-5-7-5mm-thumb-screw-for-caliper","provider":"HomeDIYer","version":"1.0","type":"link"}