{"product_id":"spi-29-420-7-class-zz-plus-plug-gage-0-42-in-dia","title":"Spi 29-420-7 Class Zz Plus Plug Gage 0.42 in Dia","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 29-420-7 is a Class ZZ Plus plug gage designed for precision hole diameter verification in production and inspection environments. It measures a nominal bore diameter of 0.42 inches with a tolerance of 0.0002 inches, meeting the requirements of Class ZZ Plus accuracy standards. Constructed from steel for durability and dimensional stability, this plug gage provides a reliable go\/no-go reference for quality control checks. Machinists, toolmakers, and quality technicians use plug gages like this to confirm that drilled, reamed, or bored holes fall within specified tolerances before parts move to the next stage of production.\u003c\/p\u003e\n\u003cp\u003eThis gage is suited for use on shop floors, in inspection rooms, and at receiving inspection stations where consistent hole diameter verification is required. It is appropriate for both low-volume prototype work and higher-volume production runs where tight tolerances must be confirmed quickly and without complex setup. The 0.42-inch diameter range fits a common fastener and bore size used across general metalworking, mechanical assembly, and machining operations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNominal measurement diameter of 0.42 inches for a common bore size\u003c\/li\u003e\n  \u003cli\u003eClass ZZ Plus tolerance of 0.0002 inches for precise go\/no-go inspection\u003c\/li\u003e\n  \u003cli\u003eSteel construction provides wear resistance and long-term dimensional stability\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.2 pounds for easy single-handed use\u003c\/li\u003e\n  \u003cli\u003eSingle-piece package quantity supports individual tooling purchases\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard Class ZZ Plus plug gage for verifying 0.42-inch nominal bore diameters in general machining and inspection applications. Suitable for use with any workpiece or fixture requiring go\/no-go hole diameter verification at this size.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePlug gages are handled and used by machinists, toolmakers, and quality control inspectors. Ensure the workpiece is clean and free of chips or coolant before gaging to avoid false readings or gage wear. Store the gage in a protective case or rack when not in use to prevent surface damage. Calibration and use should follow shop metrology procedures and applicable ASME B89 standards for gage accuracy and maintenance.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter of Measurement\u003c\/strong\u003e: 0.42 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance\u003c\/strong\u003e: 0.0002 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGage Class\u003c\/strong\u003e: ZZ Plus\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: 29-420-7\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51723263508786,"sku":"29-420-7","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8ce900653ce3680eb7bbc30d6030a58d.jpg?v=1788602392","url":"https:\/\/voomisupply.com\/products\/spi-29-420-7-class-zz-plus-plug-gage-0-42-in-dia","provider":"Voomi Supply","version":"1.0","type":"link"}