{"product_id":"spi-29-400-9-class-zz-plus-plug-gage-0-4-inch","title":"Spi 29-400-9 Class Zz Plus Plug Gage 0.4 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 29-400-9 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of machined holes and bores. It provides a go\/no-go reference standard for inside diameter inspection, confirming that a hole falls within the specified tolerance range. The gage measures at a nominal diameter of 0.4 inches with a tolerance of 0.0002 inches, making it suitable for precision quality-control work in machining, fabrication, and assembly environments. The steel construction provides durability under repeated use in shop-floor conditions. Machinists, quality technicians, and tool-and-die professionals use plug gages of this class as part of standard inspection protocol.\u003c\/p\u003e\n\u003cp\u003eClass ZZ Plus plug gages are used in production and inspection settings where hole diameter verification is required before parts advance to assembly or final inspection. This gage is appropriate for use on drilled, reamed, or bored holes in metal workpieces where dimensional conformance is critical. It is suited to both job-shop environments and higher-volume production lines where consistent go\/no-go inspection methods are standard practice.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNominal measurement diameter of 0.4 inches for consistent bore inspection\u003c\/li\u003e\n  \u003cli\u003eTolerance of 0.0002 inches provides precise Class ZZ Plus accuracy\u003c\/li\u003e\n  \u003cli\u003eSteel construction for wear resistance and long service life in shop environments\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.2 pounds for easy single-hand operation\u003c\/li\u003e\n  \u003cli\u003eSingle-piece package quantity suited to individual workstation or toolbox use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-use plug gage for inspection of machined holes at 0.4 inch nominal diameter in standard Class ZZ Plus gage applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePlug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin contact. Before use, verify the gage and workpiece are at the same ambient temperature to avoid thermal expansion error. Do not force the gage into an undersized hole, as this can damage the gage or the workpiece surface. Store the gage in its protective case when not in use to maintain calibration integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGage Class\u003c\/strong\u003e: ZZ Plus\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Diameter\u003c\/strong\u003e: 0.4 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\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: 29-400-9\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51703932223794,"sku":"29-400-9","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c723c302589f245394c0cc8235792965.jpg?v=1788419541","url":"https:\/\/voomisupply.com\/products\/spi-29-400-9-class-zz-plus-plug-gage-0-4-inch","provider":"Voomi Supply","version":"1.0","type":"link"}