{"product_id":"spi-19-391-2-class-zz-minus-plug-pin-gage-0-391-in","title":"Spi 19-391-2 Class Zz Minus Plug Pin Gage 0.391 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 19-391-2 is a Class ZZ minus plug pin gage machined from steel, used to verify that a hole or bore falls within a specified minimum acceptable size. With a nominal diameter of 0.391 inches and a tolerance of 0.0002 inches, this gage provides reliable go\/no-go measurement for quality control and inspection work. Class ZZ is the standard tolerance class for general-purpose inspection gages used in production and shop-floor environments. Machinists, toolmakers, and quality control technicians rely on pin gages like this one to confirm dimensional conformance without the variability of calipers or micrometers.\u003c\/p\u003e\n\u003cp\u003eThis plug pin gage is suited for use in machine shops, fabrication facilities, and manufacturing inspection stations. It is applied wherever a 0.391-inch diameter hole must be verified for minimum acceptable size — including checking drilled, reamed, or punched holes in metal, plastic, or composite workpieces. The minus designation means the gage is manufactured to the lower end of the nominal size, confirming that a hole is not undersized.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eClass ZZ tolerance class for general-purpose shop and production inspection\u003c\/li\u003e\n  \u003cli\u003eMinus designation confirms minimum acceptable hole size\u003c\/li\u003e\n  \u003cli\u003e0.0002 inches tolerance for precise dimensional verification\u003c\/li\u003e\n  \u003cli\u003eSteel construction for durability under repeated use\u003c\/li\u003e\n  \u003cli\u003e0.391 inches nominal diameter for direct hole conformance checking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose plug pin gage for use in standard go\/no-go inspection applications requiring a 0.391-inch nominal diameter Class ZZ minus gage.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePin gages are handled and used by machinists and quality control inspectors following standard metrology practices. Store the gage in its protective case when not in use to prevent damage to the precision-ground surface. Clean the gage and the bore being measured before use to avoid false readings caused by chips or contamination. Do not force the gage into a bore — controlled, light hand pressure is the correct technique.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Diameter\u003c\/strong\u003e: 0.391 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance\u003c\/strong\u003e: 0.0002 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance Class\u003c\/strong\u003e: Class 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\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 19-391-2\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51694111359282,"sku":"19-391-2","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2555ffcc731d6e61fd0c322c3d6f665f.jpg?v=1788320390","url":"https:\/\/voomisupply.com\/products\/spi-19-391-2-class-zz-minus-plug-pin-gage-0-391-in","provider":"Voomi Supply","version":"1.0","type":"link"}