{"product_id":"spi-19-644-4-class-zz-minus-plug-pin-gage-0-644-in","title":"Spi 19-644-4 Class Zz Minus Plug Pin Gage 0.644 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 19-644-4 is a Class ZZ minus plug pin gage with a nominal diameter of 0.644 inches and a minus tolerance of 0.0002 inches. It is used to verify hole diameters by the go\/no-go method, confirming that a drilled, reamed, or bored feature meets the lower boundary of its tolerance zone. The gage is machined from steel for durability and dimensional stability under shop conditions. Machinists, toolmakers, and quality-control technicians rely on this type of gage for fast, repeatable inspection on the production floor or in the inspection room.\u003c\/p\u003e\n\u003cp\u003eClass ZZ is the most commonly stocked commercial-grade pin gage class, suitable for general-purpose inspection work where ultra-precision gage tolerances are not required. This minus-style gage is held to the low side of the nominal diameter, making it appropriate for checking minimum hole size acceptance in standard tolerance applications. It fits into hand-held gage handle sets for single-pin use or can be stored in gage block and pin gage sets for organized inspection workflows.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e0.644-inch nominal diameter for direct hole-size verification\u003c\/li\u003e\n  \u003cli\u003eMinus tolerance of 0.0002 inches (Class ZZ specification)\u003c\/li\u003e\n  \u003cli\u003eSteel construction for hardness and wear resistance\u003c\/li\u003e\n  \u003cli\u003eCompact, lightweight form at 0.2 pounds for easy hand use\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard pin gage handle sets for single-pin inspection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard Class ZZ minus plug pin gage for use with commercially available pin gage handles and sets sized for the 0.644-inch diameter range.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Before use, clean the gage and the hole being checked with a lint-free cloth to remove chips, coolant, or debris that could affect the reading. Do not force the gage into a hole; if resistance is felt, the feature is at or below the minimum acceptable size. Store pin gages in a protective case away from moisture and temperature extremes to maintain calibration integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Diameter\u003c\/strong\u003e: 0.644 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\u003eGage 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: 19-644-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51697859756338,"sku":"19-644-4","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8c7f1e776870666ce474cc71ba6ac8b2.jpg?v=1788355133","url":"https:\/\/voomisupply.com\/products\/spi-19-644-4-class-zz-minus-plug-pin-gage-0-644-in","provider":"Voomi Supply","version":"1.0","type":"link"}