{"product_id":"spi-29-428-0-class-zz-plus-plug-gage-0-428-in-dia","title":"Spi 29-428-0 Class Zz Plus Plug Gage 0.428 in Dia","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 29-428-0 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a precise 0.428-inch nominal size. Built from steel, this go\/no-go style inspection tool delivers a tolerance of 0.0002 inches, making it suitable for quality control and dimensional inspection in machine shops, manufacturing facilities, and maintenance environments. Licensed machinists, toolmakers, and quality technicians use plug gages like this one to confirm that drilled, reamed, or bored features meet specification before parts move forward in production or assembly.\u003c\/p\u003e\n\u003cp\u003eThis gage is suited for applications requiring close-tolerance hole verification at the 0.428-inch diameter range. Typical use cases include incoming inspection of machined components, in-process quality checks on production lines, and final acceptance inspection for precision assemblies. The Class ZZ Plus classification indicates the gage meets defined tolerance standards for go\/no-go plug gages, appropriate for general-purpose inspection work where tight dimensional control is required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e0.428-inch nominal diameter for precise bore verification\u003c\/li\u003e\n  \u003cli\u003eClass ZZ Plus tolerance classification for general-purpose inspection\u003c\/li\u003e\n  \u003cli\u003e0.0002-inch tolerance for close-tolerance dimensional control\u003c\/li\u003e\n  \u003cli\u003eSteel construction for durability in shop environments\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.2 pounds for easy handling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit inspection tool for verifying bores and holes with a 0.428-inch nominal diameter in any application requiring Class ZZ Plus plug gage standards.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePlug gages are handled and used by machinists, toolmakers, and quality inspectors following standard metrology practices. Store the gage in its case when not in use to protect the precision ground surface from damage. Clean the gage and the bore being checked before use to prevent false readings caused by debris or cutting fluid. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise measurement accuracy.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter of Measurement\u003c\/strong\u003e: 0.428 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\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: 29-428-0\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":67911586513202,"sku":"29-428-0","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2d06fb855d6a30f6b3ca5c1c8294e366.jpg?v=1791212960","url":"https:\/\/voomisupply.com\/products\/spi-29-428-0-class-zz-plus-plug-gage-0-428-in-dia","provider":"Voomi Supply","version":"1.0","type":"link"}