{"product_id":"starrett-68134-mechanical-inside-micrometer-1-inch","title":"Starrett 68134 Mechanical Inside Micrometer 1 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe STARRETT 68134 is a mechanical inside micrometer designed for precision internal bore and hole measurements in professional metrology and machining applications. It features a ratchet stop thimble for consistent, repeatable gauging pressure and three self-centering contacts that automatically align the instrument for true readings. Accuracy is rated at 0.000150 inches with a graduation of 0.0003 inches, placing this tool firmly in the high-precision tier required for close-tolerance work. The measuring faces are solid carbide for long service life. This instrument is suited for machinists, tool-and-die makers, quality control technicians, and precision maintenance trades who require reliable inside measurement at the bench or in the field.\u003c\/p\u003e\n\u003cp\u003eThe 68134 covers a measurement range up to 1 inch (minimum measurement 20.00 mm) and accepts extension rods up to 6.0000 inches, extending reach for deeper bores. Gage depth is 2-5\/8 inches. A 0.7500-inch setting ring is included for calibration verification. The instrument ships complete with a case, contacts, instructions, setting ring, and wrenches, making it ready to use out of the box. It is appropriate for residential and commercial machine shops, manufacturing facilities, and any precision maintenance environment where internal bore dimensions must be verified to tenths-of-a-thousandth tolerances.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eRatchet stop thimble ensures consistent measuring pressure for repeatable results\u003c\/li\u003e\n  \u003cli\u003eThree self-centering contacts automatically align the micrometer for true bore readings\u003c\/li\u003e\n  \u003cli\u003eSolid carbide measuring faces resist wear in high-use production environments\u003c\/li\u003e\n  \u003cli\u003eAccepts extension rods up to 6.0000 inches for deep-bore access\u003c\/li\u003e\n  \u003cli\u003eIncludes setting ring (0.7500 inch diameter) for on-site calibration checks\u003c\/li\u003e\n  \u003cli\u003eComplete kit includes case, contacts, instructions, setting ring, and wrenches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard mechanical inside micrometer for use in precision measurement applications requiring internal bore gauging up to 1 inch range with extension rod capability.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis instrument should be handled by qualified metrology or machining personnel familiar with inside micrometer calibration and use procedures. Before measuring, verify calibration using the included setting ring and allow the tool to thermally stabilize in the work environment. Clean measuring faces with a lint-free cloth before each use. Store in the provided case to protect the carbide contacts and thimble mechanism from damage.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMicrometer Type\u003c\/strong\u003e: Inside\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Measurement\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Measurement\u003c\/strong\u003e: 20.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 0.000150 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation\u003c\/strong\u003e: 0.0003 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResolution\u003c\/strong\u003e: 0.000250 inches (0.0005 mm)\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: 2-5\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Extension Rod Length\u003c\/strong\u003e: 6.0000 inches (152.40 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSetting Ring Diameter\u003c\/strong\u003e: 0.7500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Setting Rings Included\u003c\/strong\u003e: 1\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: 1.7 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes\u003c\/strong\u003e: Case, Contacts, Instructions, Setting Ring, Wrenches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 68134\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51540162674994,"sku":"68134","price":1120.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/68aa04bea735b90164abd8fffe44f777.jpg?v=1785847586","url":"https:\/\/voomisupply.com\/products\/starrett-68134-mechanical-inside-micrometer-1-inch","provider":"Voomi Supply","version":"1.0","type":"link"}