{"product_id":"3227-20","title":"16-20mm 0.63-0.79\" Three Point Internal Bore Micrometer - 3227 Series (Insize)","description":"\u003cdiv\u003e\n\u003cp\u003e\nThe Insize 3227 Three-Point Internal Bore Micrometer is a precision measuring tool designed for accurate inside-diameter checks. With three-point contact, it delivers stable, repeatable readings across bore walls, making it ideal for engineers, machinists, quality inspectors, and serious hobbyists who need dependable internal measurements in tight tolerances.\n\u003c\/p\u003e \u003cp\u003e\nThis model covers bore sizes from 16–20 mm (0.63–0.79\") and can measure up to 300 mm. It features a fine 0.005 mm graduation, carbide measuring faces for wear resistance, a ratchet stop to ensure consistent contact pressure, and it is supplied with a setting ring for quick, reliable zeroing. These features combine to provide long-life reliability in demanding workshop environments.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eThree-point internal measurement\u003c\/b\u003e: achieves stable, repeatable readings by evenly distributing contact pressure around the bore, reducing eccentricity errors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCarbide measuring faces\u003c\/b\u003e: designed for wear resistance and longevity, maintaining accuracy even after frequent use in metalworking environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRatchet stop with setting ring\u003c\/b\u003e: delivers consistent touch and easy zeroing, minimizing user variation and speeding up repetitive inspections.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nIn use, this bore micrometer helps you quickly verify internal diameters with confidence, reducing rework and downtime. Its rugged construction and precise graduation enable reliable results across a wide range of bore sizes, making it a trusted addition to any inspection bench or machine shop workflow.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Insize","offers":[{"title":"Default Title","offer_id":43572600602702,"sku":"3227-20","price":219.13,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/3227-INSIZE-1_b758342a-76ef-477b-b5b8-81f37b6d15be.jpg?v=1774261522","url":"https:\/\/www.protool-ltd.co.uk\/products\/3227-20","provider":"Protool Precision Tools","version":"1.0","type":"link"}