{"product_id":"fowler-52-243-212-1-inside-micrometer-set-2-12-in","title":"Fowler 52-243-212-1 Inside Micrometer Set 2-12 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe FOWLER 52-243-212-1 is a mechanical inside micrometer set designed for precision internal bore and ID measurements across a 2 to 12 inch range. The set uses a single measuring head paired with five extension rods, allowing technicians to cover a wide measurement span without switching instruments. Solid carbide measuring faces deliver durability in repetitive use. Accuracy is rated at 0.0007 inches, making this set suitable for close-tolerance work in machining, maintenance, and fabrication environments. The friction thimble provides consistent measuring force, and a positive locking nut holds the spindle in position during reading transfer.\u003c\/p\u003e\u003cp\u003eThis inside micrometer set is used in machine shops, industrial maintenance facilities, and precision fabrication settings where accurate internal diameter measurements are required. Typical applications include measuring cylinder bores, bushing IDs, bearing seats, and housing bores. The five-rod extension system allows a single head to service a broad range of bore diameters, reducing tooling cost and setup time. The set ships factory-calibrated and includes a standard, wrench, and fitted case for organized storage and transport.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMeasurement range of 2 to 12 inches via five extension rods and one measuring head\u003c\/li\u003e\n\u003cli\u003eSolid carbide measuring faces for wear resistance and long service life\u003c\/li\u003e\n\u003cli\u003eFriction thimble for consistent, repeatable measuring force\u003c\/li\u003e\n\u003cli\u003ePositive locking nut on spindle secures reading before transfer\u003c\/li\u003e\n\u003cli\u003eAnvil and spindle are hardened and precision ground with microlap finish on ends\u003c\/li\u003e\n\u003cli\u003eSpindle thread hardened, ground, and lapped for smooth, accurate advancement\u003c\/li\u003e\n\u003cli\u003eFactory-calibrated and includes fitted case, standard, and wrench\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose mechanical inside micrometer set suitable for standard inch-system metrology applications in machine shops and industrial maintenance environments.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInside micrometer sets are installed and serviced by machinists, metrologists, and precision maintenance technicians. Before use, verify calibration against the included standard and ensure the measuring faces are clean and free of debris. Follow shop metrology procedures for handling carbide-tipped instruments to avoid chipping the measuring faces. Store the set in the fitted case when not in use to protect the extension rods and measuring head from damage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e: 2 to 12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Measurement\u003c\/strong\u003e: 2.0000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 0.0007 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasuring Face Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRod Type\u003c\/strong\u003e: Extension\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThimble Type\u003c\/strong\u003e: Friction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Satin Chrome\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Extension Rods\u003c\/strong\u003e: 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Heads\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibrated\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes\u003c\/strong\u003e: Fitted Case, Standard, Wrench\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: FOWLER\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52-243-212-1\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FOWLER","offers":[{"title":"Default Title","offer_id":67908501340466,"sku":"52-243-212-1","price":359.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f061ae1f586667ccb9c344a4fb0f8542.jpg?v=1791183777","url":"https:\/\/voomisupply.com\/products\/fowler-52-243-212-1-inside-micrometer-set-2-12-in","provider":"Voomi Supply","version":"1.0","type":"link"}