{"product_id":"spi-22-156-4-class-zz-plug-gage-set-250-piece","title":"Spi 22-156-4 Class Zz Plug Gage Set 250 Piece","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 22-156-4 is a 250-piece Class ZZ plug gage set covering a diameter range of 0.251 to 0.500 inches. Each pin is manufactured from steel and held to a plus tolerance of 0.0002 inches, conforming to NIST traceable standards. The set is designed for shop-floor and inspection environments where fast, reliable hole measurement is required. Machinists, quality control technicians, and tool-room professionals use plug gage sets to verify bore diameters, measure slot widths, and confirm center-to-center distances between holes without the setup time required by variable measuring instruments.\u003c\/p\u003e\u003cp\u003eThis set is suited for production inspection in light manufacturing, precision machining, and metal fabrication environments. Class ZZ gages are the standard classification for working gages used in GO gage inspection applications. The 250-piece range from 0.251 to 0.500 inches provides comprehensive coverage for the most common small-bore and slot-width verification tasks found in both job-shop and high-volume manufacturing settings. The included pin gage holder keeps pins organized and accessible at the bench or inspection station.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e250-piece set spanning 0.251 to 0.500 inches in diameter\u003c\/li\u003e\n\u003cli\u003eClass ZZ tolerance classification with a plus tolerance of 0.0002 inches\u003c\/li\u003e\n\u003cli\u003eNIST traceable Certificate of Accuracy included with the set\u003c\/li\u003e\n\u003cli\u003eSteel construction for durability in production and inspection use\u003c\/li\u003e\n\u003cli\u003ePin gage holder included for organized storage and bench access\u003c\/li\u003e\n\u003cli\u003eSuitable for GO gage inspection, hole sizing, slot width measurement, and hole-spacing calculations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard Class ZZ plug gage set for use in any inspection or machining environment requiring hole and slot measurement in the 0.251 to 0.500 inch diameter range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003ePlug gages are hand tools and do not require installation; however, proper handling is essential to maintain accuracy. Keep pins clean and lightly oiled to prevent corrosion and wear. Never force a pin gage into a bore — if the pin does not enter under light hand pressure, select the appropriate size. Store pins in the provided holder when not in use to prevent damage to the ground surfaces.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Diameter\u003c\/strong\u003e: 0.251 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Diameter\u003c\/strong\u003e: 0.500 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 Type\u003c\/strong\u003e: Plus\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass\u003c\/strong\u003e: ZZ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Pieces\u003c\/strong\u003e: 250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NIST Traceable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 17.72 inches L x 12.2 inches W x 2.83 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 21.94 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 22-156-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51702423552306,"sku":"22-156-4","price":232.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/696a0c2d23e6b827355734ecffbef104.jpg?v=1788410759","url":"https:\/\/voomisupply.com\/products\/spi-22-156-4-class-zz-plug-gage-set-250-piece","provider":"Voomi Supply","version":"1.0","type":"link"}