{"product_id":"starrett-52998-interchangeable-anvil-micrometer-36-42-in","title":"Starrett 52998 Interchangeable Anvil Micrometer 36-42 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 52998 is a mechanical interchangeable anvil micrometer designed for large-diameter precision measurement in the 36 to 42 inch range. It features a friction thimble for consistent measuring pressure and a ring-type lock nut to secure the spindle at the desired reading. Graduation is 0.001 inches, giving technicians and machinists the resolution needed for close-tolerance work on large bores, shafts, and structural components. The spindle and anvil are both steel construction. This tool is intended for use by machinists, metrologists, and precision measurement professionals working with oversized workpieces.\u003c\/p\u003e\u003cp\u003eThe STARRETT 52998 is suited for shop-floor and inspection-room applications where large external dimensions must be verified with mechanical precision. The interchangeable anvil system allows the single micrometer body to cover the full 36 to 42 inch span by swapping anvils, reducing the need for multiple dedicated instruments. The package includes 37, 39, and 41 inch standards, a lock nut, and a wrench, providing the accessories needed for calibration and setup at each anvil position.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMechanical operation — no battery or electronics required\u003c\/li\u003e\n\u003cli\u003eFriction thimble ensures repeatable measuring force\u003c\/li\u003e\n\u003cli\u003e0.001 inch graduation for close-tolerance large-diameter measurement\u003c\/li\u003e\n\u003cli\u003eRing-type lock nut secures spindle position during reading transfer\u003c\/li\u003e\n\u003cli\u003eInterchangeable anvil design covers 36 to 42 inch range with 2 anvils\u003c\/li\u003e\n\u003cli\u003eIncludes 37, 39, and 41 inch standards, lock nut, and wrench for full setup\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-use interchangeable anvil micrometer for large-diameter mechanical measurement applications in the 36 to 42 inch range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis instrument is used by machinists and metrologists and does not require installation in the traditional sense, but proper setup is essential for accurate readings. Before use, verify the micrometer with the included standards at each anvil position and zero as needed. Handle the anvils and spindle contact surfaces carefully to avoid nicks or contamination that would affect measurement accuracy. Follow the manufacturer instructions for wrench torque when securing anvils to the micrometer body.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Measurement\u003c\/strong\u003e: 36 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Measurement\u003c\/strong\u003e: 42 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation\u003c\/strong\u003e: 0.001 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation Type\u003c\/strong\u003e: Mechanical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThimble Type\u003c\/strong\u003e: Friction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock Nut Type\u003c\/strong\u003e: Ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Anvils\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle Diameter\u003c\/strong\u003e: 0.300 inches (7.60 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnvil Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital Counter\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes\u003c\/strong\u003e: 37, 39, and 41 inch standards; lock nut; wrench\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 48 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications\u003c\/strong\u003e: California Proposition 65\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: STARRETT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52998\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51543050027314,"sku":"52998","price":4022.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/20d9e45863d796afbfe8ff342457778d.jpg?v=1785914567","url":"https:\/\/voomisupply.com\/products\/starrett-52998-interchangeable-anvil-micrometer-36-42-in","provider":"Voomi Supply","version":"1.0","type":"link"}