{"product_id":"spi-29-438-9-class-zz-plus-plug-gage-0-438-in","title":"Spi 29-438-9 Class Zz Plus Plug Gage 0.438 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 29-438-9 is a Class ZZ Plus plug gage designed for go\/no-go dimensional inspection of bored holes, drilled passages, and machined openings at a nominal diameter of 0.438 inches. Class ZZ Plus gages are manufactured to a tolerance of 0.0002 inches, making them suitable for production inspection tasks where consistent hole-size verification is required. The steel construction provides durability through repeated use in shop-floor environments. This gage is used by machinists, quality technicians, and tool-and-die professionals to confirm that a feature meets dimensional specification before assembly or further machining proceeds.\u003c\/p\u003e\n\u003cp\u003eThis plug gage is applied in manufacturing and machining operations where hole diameter must be verified to a defined tolerance. Typical use cases include incoming inspection, in-process quality checks on CNC or manual machine output, and final inspection before component release. The 0.438-inch nominal size fits a range of common fastener clearance holes and precision-bored features found in mechanical assemblies, hydraulic components, and pneumatic fittings. It is well suited to both job-shop and production-floor inspection stations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eClass ZZ Plus tolerance grade at 0.0002 inches for reliable production inspection\u003c\/li\u003e\n  \u003cli\u003eNominal measurement diameter of 0.438 inches\u003c\/li\u003e\n  \u003cli\u003eSteel construction for wear resistance and dimensional stability\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.2 pounds for easy single-hand use\u003c\/li\u003e\n  \u003cli\u003eIndividual unit packaging suitable for tool crib or inspection kit storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style plug gage for go\/no-go inspection of 0.438-inch nominal diameter holes in general machining and quality-control applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePlug gages require no installation but must be handled and stored correctly to maintain accuracy. Always clean the gage and the feature being checked before use to prevent debris from affecting readings. Do not force the gage into an undersized hole, as this can damage the gage surface and alter its calibration. Periodic recalibration against a traceable standard is recommended to confirm the gage remains within its stated tolerance class.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMeasurement Diameter\u003c\/strong\u003e: 0.438 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 (mm)\u003c\/strong\u003e: 0.0002 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance 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  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: 29-438-9\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51695079457074,"sku":"29-438-9","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9bb1f01327d9fb160529936cf0c86268.jpg?v=1788331140","url":"https:\/\/voomisupply.com\/products\/spi-29-438-9-class-zz-plus-plug-gage-0-438-in","provider":"Voomi Supply","version":"1.0","type":"link"}