{"product_id":"spi-19-309-4-class-zz-minus-plug-pin-gage-0-309-in","title":"Spi 19-309-4 Class Zz Minus Plug Pin Gage 0.309 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 19-309-4 is a Class ZZ minus plug pin gage used to verify bore and hole dimensions in precision machining and inspection applications. It measures 0.309 inches in diameter and is manufactured from steel for durability and consistent dimensional stability. With a tolerance of 0.0002 inches, this gage is suited for go\/no-go inspection workflows where tight dimensional control is required. Machinists, quality control technicians, and tool-and-die professionals use plug pin gages like this one as a reliable, low-cost method for confirming hole size compliance on the shop floor or in an inspection room.\u003c\/p\u003e\u003cp\u003eThis gage is appropriate for use in manufacturing environments where hole diameter verification is part of routine quality assurance. Class ZZ is the standard tolerance class for plug gages used in general inspection of production parts. The minus designation indicates the gage is ground to the low side of the nominal diameter, which is the standard configuration for go-gage applications. It is suited for use on ferrous and non-ferrous workpieces in both job shop and production settings.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e0.309 inches nominal diameter for precise bore inspection\u003c\/li\u003e\n\u003cli\u003eClass ZZ tolerance class — standard for general-purpose plug gaging\u003c\/li\u003e\n\u003cli\u003eMinus designation ground to low side of nominal for go-gage use\u003c\/li\u003e\n\u003cli\u003e0.0002 inches tolerance for accurate dimensional verification\u003c\/li\u003e\n\u003cli\u003eSteel construction for wear resistance and dimensional stability\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose plug pin gage for use in standard go\/no-go inspection setups compatible with 0.309 inches nominal bore diameter applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003ePlug pin gages are handled and used by machinists and quality control technicians — no installation in the traditional sense is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into an undersized bore, as this can damage both the gage and the workpiece. Store separately from other gages and hard tooling to avoid surface damage that could affect accuracy.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Diameter\u003c\/strong\u003e: 0.309 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTolerance (Decimal Inch)\u003c\/strong\u003e: 0.0002 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTolerance (mm)\u003c\/strong\u003e: 0.0002 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass\u003c\/strong\u003e: ZZ Minus\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.2 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: 19-309-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51715621814578,"sku":"19-309-4","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2ac13a6c0f25ec6a0fd15846aab5b589.jpg?v=1788516450","url":"https:\/\/voomisupply.com\/products\/spi-19-309-4-class-zz-minus-plug-pin-gage-0-309-in","provider":"Voomi Supply","version":"1.0","type":"link"}