{"product_id":"mitutoyo-331-351-30-electronic-spline-micrometer-1-in","title":"Mitutoyo 331-351-30 Electronic Spline Micrometer 1 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe MITUTOYO 331-351-30 is an electronic spline micrometer designed for precision outside-diameter measurement of splined shafts, keyways, and other narrow or recessed workpiece features. It delivers a measuring range of 1 inch with an accuracy of 0.0001 inch and a resolution of 0.00005 inch (0.001 mm), making it suitable for high-tolerance machining and inspection work. The slim spline head allows access into tight geometry where a conventional outside micrometer cannot reach. A ratchet stop thimble ensures repeatable, consistent measuring force on every reading. The satin chrome finish reduces glare and resists corrosion in shop environments.\u003c\/p\u003e\n\u003cp\u003eThis micrometer is used in precision machine shops, toolrooms, quality control labs, and manufacturing environments where splined components require accurate dimensional verification. The 0.25 inch spindle diameter and narrow head geometry are intended for measuring spline root diameters, gear features, and similar tight-clearance surfaces. Data output capability allows integration with statistical process control (SPC) systems and external data loggers, supporting ISO-compliant inspection workflows. It ships complete with a plastic storage case. Installation and use are performed by machinists, metrologists, quality technicians, and tool-and-die professionals.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eElectronic readout with 0.00005 inch (0.001 mm) resolution for high-precision measurement\u003c\/li\u003e\n  \u003cli\u003eAccuracy rated to 0.0001 inch, meeting tight-tolerance inspection requirements\u003c\/li\u003e\n  \u003cli\u003e1.2598 inch throat depth provides reach into recessed or splined geometry\u003c\/li\u003e\n  \u003cli\u003eRatchet stop thimble delivers consistent, repeatable spindle pressure\u003c\/li\u003e\n  \u003cli\u003eData output port supports SPC and external recording systems\u003c\/li\u003e\n  \u003cli\u003eSatin chrome finish minimizes glare and improves durability in shop use\u003c\/li\u003e\n  \u003cli\u003eTUV certified; includes plastic carrying case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a precision measurement instrument for splined shafts and narrow-profile workpieces requiring outside-diameter measurement within a 1 inch range. Compatible with standard SPC data collection systems via the built-in data output port.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis instrument requires no installation in the traditional trade sense but should be handled and stored by qualified metrology or quality personnel. Before use, verify calibration against a known standard and allow the micrometer to thermally stabilize to shop ambient temperature. Clean the spindle faces and anvil with a lint-free cloth before measurement. Do not force the spindle or use the thimble barrel to apply excess pressure beyond what the ratchet stop allows.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMeasuring Range\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThroat Depth\u003c\/strong\u003e: 1.2598 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 0.0001 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResolution\u003c\/strong\u003e: 0.00005 inch \/ 0.001 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpindle Diameter\u003c\/strong\u003e: 0.25 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperation Type\u003c\/strong\u003e: Electronic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnvil Type\u003c\/strong\u003e: Flat\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpindle Type\u003c\/strong\u003e: Flat\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThimble Type\u003c\/strong\u003e: Ratchet Stop\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDigital Counter\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRotating Spindle\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eData Output\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Satin Chrome\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes\u003c\/strong\u003e: Plastic Case\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertification\u003c\/strong\u003e: TUV Certified\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\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: 331-351-30\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MITUTOYO","offers":[{"title":"Default Title","offer_id":51564249547058,"sku":"331-351-30","price":628.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/de49fdbb3fc088b24ff4d53e92fefb10.jpg?v=1786515326","url":"https:\/\/voomisupply.com\/products\/mitutoyo-331-351-30-electronic-spline-micrometer-1-in","provider":"Voomi Supply","version":"1.0","type":"link"}