{"product_id":"spi-29-321-7-class-zz-plus-plug-gage-0-321-in","title":"Spi 29-321-7 Class Zz Plus Plug Gage 0.321 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 29-321-7 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.321 inches with a tolerance of 0.0002 inches. Machined from steel, this fixed-limit gage provides a reliable go\/no-go reference for quality control inspection in machine shops, manufacturing facilities, and production environments. Machinists, quality technicians, and toolroom professionals use plug gages like this one to confirm that drilled, reamed, or bored holes meet specification before parts advance to the next stage of production.\u003c\/p\u003e\n\u003cp\u003eThe 29-321-7 is suited for inspection applications requiring precise diameter verification at the 0.321-inch nominal size. Class ZZ tolerance class is appropriate for general-purpose inspection and incoming quality checks. The gage is packaged individually and is ready for immediate use on the shop floor or inspection bench.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNominal diameter of 0.321 inches for direct bore verification\u003c\/li\u003e\n  \u003cli\u003eClass ZZ Plus tolerance of 0.0002 inches for reliable go\/no-go inspection\u003c\/li\u003e\n  \u003cli\u003eSteel construction for durability and dimensional stability under normal shop conditions\u003c\/li\u003e\n  \u003cli\u003eCompact form factor at 0.2 pounds for easy handling at the inspection station\u003c\/li\u003e\n  \u003cli\u003eIndividual packaging — no additional components required out of the box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a fixed-limit plug gage for general-purpose bore inspection of holes nominally sized at 0.321 inches across machined, drilled, or reamed workpieces in metalworking and manufacturing applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePlug gages are inspection instruments, not cutting tools — never force a plug gage into a bore or use it to remove material. Handle with clean, dry hands or inspection gloves to prevent corrosion from skin oils. Store in a protective case away from heat sources and abrasive surfaces to maintain dimensional accuracy. Periodic calibration against certified master gages is recommended to ensure continued measurement integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Diameter\u003c\/strong\u003e: 0.321 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 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: 29-321-7\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51698866454834,"sku":"29-321-7","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/edc08da55d68767c8315e163d4dd8185.jpg?v=1788369083","url":"https:\/\/voomisupply.com\/products\/spi-29-321-7-class-zz-plus-plug-gage-0-321-in","provider":"Voomi Supply","version":"1.0","type":"link"}