{"product_id":"spi-10-721-9-mechanical-hole-micrometer-0-5-to-0-65-inch","title":"Spi 10-721-9 Mechanical Hole Micrometer 0.5 to 0.65 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 10-721-9 is a mechanical hole micrometer designed for precise internal bore measurement in the range of 0.5000 to 0.6500 inches. It delivers a graduation of 0.0002 inches and an accuracy of 0.0002 inches, making it appropriate for close-tolerance inspection work in machining, manufacturing, and mechanical service environments. The three-point contact design is self-aligning and self-centering, which reduces operator-induced error during measurement. Solid carbide measuring anvils provide long-term wear resistance. The ratchet stop thimble delivers consistent measuring force, limiting over-tightening and improving repeatability across multiple readings.\u003c\/p\u003e\u003cp\u003eThis hole micrometer is suited for dimensional inspection of precision bores, bushings, and cylindrical bores in light manufacturing, machine shops, and mechanical repair facilities. The 0.5000 to 0.6500 inch range makes it appropriate for small-diameter internal measurements where standard plug gauges or two-point bore gauges may not provide the required accuracy. A gage depth of 2.36 inches allows reach into most standard bore configurations. Installation and use do not require a power source, making it fully portable for bench or in-machine use.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMeasurement range: 0.5000 to 0.6500 inches\u003c\/li\u003e\n\u003cli\u003eGraduation and accuracy: 0.0002 inches\u003c\/li\u003e\n\u003cli\u003eThree-point contact design — self-aligning and self-centering\u003c\/li\u003e\n\u003cli\u003eSolid carbide measuring anvils for extended wear life\u003c\/li\u003e\n\u003cli\u003eRatchet stop thimble for consistent, repeatable measuring force\u003c\/li\u003e\n\u003cli\u003eGage depth of 2.36 inches for reach into standard bores\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose mechanical hole micrometer for internal bore measurement applications requiring a 0.5000 to 0.6500 inch measuring range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis instrument is used by machinists, quality technicians, and precision mechanics performing dimensional inspection. Before use, zero the micrometer against the included or appropriate setting ring sized to the measuring range. Handle the carbide anvils with care to avoid nicks or contamination that could affect accuracy. Store in a protective case away from temperature extremes to maintain calibration integrity.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicrometer Type\u003c\/strong\u003e: Hole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Measurement\u003c\/strong\u003e: 0.5000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Measurement\u003c\/strong\u003e: 0.6500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation\u003c\/strong\u003e: 0.0002 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 0.0002 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThimble Type\u003c\/strong\u003e: Ratchet Stop\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasuring Face Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Contact Points\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGage Depth\u003c\/strong\u003e: 2.36 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Extension Rod Length\u003c\/strong\u003e: 6.0000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSetting Ring Diameter\u003c\/strong\u003e: 0.6500 inches\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: 0.75 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: SPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 10-721-9\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51716410343730,"sku":"10-721-9","price":338.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2edd3f1c4470058a2529f0b51b27e30f.jpg?v=1788525645","url":"https:\/\/voomisupply.com\/products\/spi-10-721-9-mechanical-hole-micrometer-0-5-to-0-65-inch","provider":"Voomi Supply","version":"1.0","type":"link"}