{"product_id":"spi-10-744-1-mechanical-hole-micrometer-3-2-inch-range","title":"Spi 10-744-1 Mechanical Hole Micrometer 3.2 Inch Range","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 10-744-1 is a mechanical hole micrometer designed for precise internal bore measurement. It features a ratchet stop thimble for consistent gauging pressure and solid carbide measuring anvils for long-term durability in production and inspection environments. The instrument delivers a graduation of 0.0002 inches and an accuracy of 0.000250 inches, making it suitable for applications where close-tolerance bore verification is required. Machinists, toolmakers, and quality control technicians use this micrometer for measuring hole diameters in metal, plastic, and composite workpieces.\u003c\/p\u003e\u003cp\u003eThe SPI 10-744-1 is suited for shop-floor and lab metrology applications requiring accurate internal diameter measurement. The three-contact-point design promotes self-aligning and self-centering behavior inside a bore, reducing operator error during measurement. The micrometer covers a maximum measurement range of 3.2 inches, with a maximum extension rod length of 6.0 inches and a gage depth of 3.54 inches. It is appropriate for use in precision machining, manufacturing quality control, and tool and die work where repeatable bore measurement is critical.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide measuring anvils for extended wear resistance\u003c\/li\u003e\n\u003cli\u003eRatchet stop thimble provides consistent and repeatable gauging force\u003c\/li\u003e\n\u003cli\u003eThree-contact-point design is self-aligning and self-centering in bore\u003c\/li\u003e\n\u003cli\u003e0.0002 inch graduation with 0.000250 inch accuracy\u003c\/li\u003e\n\u003cli\u003eMaximum extension rod length of 6.0 inches for deeper bore access\u003c\/li\u003e\n\u003cli\u003eNo digital counter — purely mechanical readout for reliable shop use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-use hole micrometer for internal bore measurement applications requiring a 3.2 inch maximum range; no setting rings are included with this unit.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis instrument is handled and used by machinists, toolmakers, or quality control technicians — no power source or wiring is required. Before use, clean the measuring anvils and bore surface to remove debris that could affect readings. Store the micrometer in its case away from heat sources and cutting fluids to preserve calibration. Periodic calibration verification against a certified standard is recommended to maintain measurement integrity.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Measurement Range\u003c\/strong\u003e: 3.2 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: 0.000250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicrometer Type\u003c\/strong\u003e: Hole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThimble Type\u003c\/strong\u003e: Ratchet Stop\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Contact Points\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasuring Face Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGage Depth\u003c\/strong\u003e: 3.54 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Extension Rod Length\u003c\/strong\u003e: 6.0 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSetting Ring Diameter\u003c\/strong\u003e: 3.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Setting Rings Included\u003c\/strong\u003e: 0\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: 2.8 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: 10-744-1\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51697183097138,"sku":"10-744-1","price":416.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f2e96e7960a6f5dda174c544e8564c28.jpg?v=1788350339","url":"https:\/\/voomisupply.com\/products\/spi-10-744-1-mechanical-hole-micrometer-3-2-inch-range","provider":"Voomi Supply","version":"1.0","type":"link"}