{"product_id":"spi-29-421-5-class-zz-plus-plug-gage-0-421-in-dia","title":"Spi 29-421-5 Class Zz Plus Plug Gage 0.421 in Dia","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 29-421-5 is a Class ZZ Plus plug gage used to verify the inside diameter of holes to a nominal size of 0.421 inches. It is manufactured from steel and holds a tolerance of 0.0002 inches, making it suitable for go\/no-go inspection work in production and quality-control environments. Machinists, toolmakers, and QC inspectors use plug gages like this one to confirm bore dimensions on machined parts, castings, and assemblies. Class ZZ is the standard tolerance class for general-purpose inspection, and the Plus designation indicates the gage is sized at the upper end of the tolerance band.\u003c\/p\u003e\n\u003cp\u003eThis plug gage is used in machine shops, manufacturing facilities, and maintenance environments where hole diameter verification is part of a standard inspection process. It is appropriate for checking drilled, reamed, or bored holes in metal, plastic, or composite workpieces. The 0.421-inch nominal diameter makes it a direct fit for inspection of holes in that size range without requiring a gage block stack or indicating bore gage setup.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNominal diameter of 0.421 inches for direct hole inspection at that size\u003c\/li\u003e\n  \u003cli\u003eClass ZZ Plus tolerance class rated at 0.0002 inches for general-purpose go\/no-go work\u003c\/li\u003e\n  \u003cli\u003eSteel construction for durability and dimensional stability under shop conditions\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.2 pounds for easy single-hand use at the inspection station\u003c\/li\u003e\n  \u003cli\u003eSingle-piece packaging suitable for individual replacement or toolbox stocking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct addition to any Class ZZ plug gage set requiring a 0.421-inch nominal diameter member.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePlug gages are used by machinists and quality-control inspectors and require no installation tools. Handle with clean, dry hands or inspection gloves to prevent corrosion from skin oils, and store in a protective case when not in use. Before use, verify the gage surface is free of burrs, chips, or debris that could affect the measurement reading. Periodic recalibration against certified masters is recommended to maintain traceability.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Diameter\u003c\/strong\u003e: 0.421 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance\u003c\/strong\u003e: 0.0002 inches (0.0002 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance Class\u003c\/strong\u003e: Class 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: 29-421-5\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51720927969586,"sku":"29-421-5","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/499261f6b947e8b7c78ab12ba9dff7ea.jpg?v=1788571082","url":"https:\/\/voomisupply.com\/products\/spi-29-421-5-class-zz-plus-plug-gage-0-421-in-dia","provider":"Voomi Supply","version":"1.0","type":"link"}