{"product_id":"mitutoyo-123-128-disc-micrometer-3-to-4-inch","title":"Mitutoyo 123-128 Disc Micrometer 3 to 4 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe MITUTOYO 123-128 is a mechanical disc micrometer designed to measure workpieces in the 3 to 4 inch range where a standard flat anvil cannot reach recessed or narrow features. The 20mm disc anvil and spindle allow measurement of grooves, keyways, and disc-shaped workpieces that would be inaccessible to a conventional outside micrometer. Accuracy is rated at 0.0003 inch, with a 0.001 inch graduation and a resolution of 0.00005 inch. A ratchet stop thimble provides consistent measuring pressure for repeatable readings across multiple measurements or operators. The satin chrome finish reduces glare under shop lighting. Licensed HVAC, tool, and precision-measurement technicians install and use this instrument in production and field service environments.\u003c\/p\u003e\n\u003cp\u003eThe 123-128 is suited for dimensional inspection of disc-shaped components, thin flanges, grooves, and similar features on machined parts. Its 20mm disc diameter and 0.70mm disc edge thickness allow entry into tight clearances where a ball-end or flat anvil cannot seat properly. This micrometer is commonly used in machine shops, manufacturing lines, and maintenance settings where groove or disc-feature measurement is part of routine quality control or setup verification. One SR44 battery is included for the instrument indicator circuit.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3 to 4 inch measuring range for mid-size disc and groove features\u003c\/li\u003e\n  \u003cli\u003e0.0003 inch accuracy with 0.001 inch graduation and 0.00005 inch resolution\u003c\/li\u003e\n  \u003cli\u003e20mm disc diameter and 0.70mm disc edge thickness for access to tight grooves\u003c\/li\u003e\n  \u003cli\u003eRatchet stop thimble ensures consistent, repeatable measuring force\u003c\/li\u003e\n  \u003cli\u003eSteel anvil and spindle materials for durability under shop conditions\u003c\/li\u003e\n  \u003cli\u003eSatin chrome finish reduces glare and surface reflectance\u003c\/li\u003e\n  \u003cli\u003eTUV Certified to established dimensional measurement standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-specification disc micrometer for measuring grooves, keyways, and disc-shaped part features in the 3 to 4 inch range. Suitable for use wherever a 20mm disc anvil profile is required for feature access.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis instrument is handled and calibrated by qualified metrology technicians or precision machinists. Before use, clean contact surfaces and verify zero calibration against a known standard. Do not overtighten the thimble against a workpiece; use the ratchet stop to apply consistent measuring force. Store in the supplied case away from temperature extremes and moisture to maintain calibration integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Measurement\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Measurement\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 0.0003 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation\u003c\/strong\u003e: 0.001 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResolution\u003c\/strong\u003e: 0.00005 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisc Diameter\u003c\/strong\u003e: 20mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisc Edge Thickness\u003c\/strong\u003e: 0.70mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnvil Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpindle Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Satin Chrome\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery\u003c\/strong\u003e: SR44 (1 included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertifications\u003c\/strong\u003e: TUV Certified\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: MITUTOYO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 123-128\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MITUTOYO","offers":[{"title":"Default Title","offer_id":51562815783218,"sku":"123-128","price":418.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/29a247b168d2abf6d58dfe07dd2d9cd6.jpg?v=1786485007","url":"https:\/\/voomisupply.com\/products\/mitutoyo-123-128-disc-micrometer-3-to-4-inch","provider":"Voomi Supply","version":"1.0","type":"link"}