{"product_id":"starrett-53056-mechanical-tubular-micrometer-40-in","title":"Starrett 53056 Mechanical Tubular Micrometer 40 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 53056 is a mechanical tubular micrometer designed for large-diameter and deep-reach measurement work. It covers a 40-inch measurement range with 0.001-inch graduation and an accuracy of 0.0001 inches, making it a reliable tool for precision layout and inspection tasks. The friction thimble provides consistent measuring force to reduce operator-induced error. A satin chrome finish resists corrosion and glare under shop lighting. This instrument is intended for use by machinists, tool-and-die makers, metrology technicians, and precision fabricators who require accurate measurement across extended ranges.\u003c\/p\u003e\u003cp\u003eThis micrometer is suited for applications requiring measurement of large workpieces, bore depths, or tubular stock where a standard micrometer falls short. The 40-inch range is achieved through a system of 10 extension rods, each with a 3\/8-inch (9.53 mm) diameter, that allow the user to build up the required measurement reach incrementally. The hardened and ground anvils on the rods are adjustable for length, ensuring contact integrity across the full range. This setup is commonly used in machine shops, tool rooms, and industrial inspection environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e40-inch measurement range achieved via 10 interchangeable extension rods\u003c\/li\u003e\n\u003cli\u003e0.001-inch graduation for precise readings\u003c\/li\u003e\n\u003cli\u003e0.0001-inch accuracy for demanding inspection work\u003c\/li\u003e\n\u003cli\u003eFriction thimble for controlled, repeatable measuring force\u003c\/li\u003e\n\u003cli\u003eHardened and ground anvils on rods, adjustable for length\u003c\/li\u003e\n\u003cli\u003eSatin chrome finish for corrosion resistance and reduced glare\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style precision measuring instrument compatible with standard tubular micrometer extension rod systems using 3\/8-inch diameter rods.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis instrument is used and calibrated by qualified metrology personnel or precision machinists. Before use, verify all extension rod connections are fully seated and the anvil surfaces are clean and free of debris. Periodically check calibration against a certified gauge standard, particularly after rod changes or any impact to the instrument. Store in the provided case to protect the satin chrome surfaces and rod threads from damage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e: 40 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation\u003c\/strong\u003e: 0.001 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 0.0001 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThimble Type\u003c\/strong\u003e: Friction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Extension Rods\u003c\/strong\u003e: 10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRod Diameter\u003c\/strong\u003e: 3\/8 inch (9.53 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel per Setting\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Satin Chrome\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnvils\u003c\/strong\u003e: Hardened and Ground, Adjustable for Length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital Counter\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.375 pounds\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: 53056\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51540363116850,"sku":"53056","price":936.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a8184f815aa4475e58efbe328804f5df.jpg?v=1785853388","url":"https:\/\/voomisupply.com\/products\/starrett-53056-mechanical-tubular-micrometer-40-in","provider":"Voomi Supply","version":"1.0","type":"link"}