{"product_id":"spi-23-207-4-threaded-ring-gage-1-12-class-2a-go-no-go","title":"Spi 23-207-4 Threaded Ring Gage 1-12 Class 2A Go No Go","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 23-207-4 is a double-ring threaded ring gage designed to verify the dimensional accuracy of 1-12 externally threaded fasteners and components. It includes both a Go ring and a No Go ring in a single tool, allowing technicians to confirm that a threaded part falls within the acceptable tolerance range for Class 2A fits in a single inspection sequence. Constructed from tool steel for durability and dimensional stability, this gage meets NIST traceability standards and ships with a NIST traceability certification. It is used in quality control and inspection workflows across manufacturing, machining, and mechanical assembly environments.\u003c\/p\u003e\u003cp\u003eThis gage is suited for inspecting 1-12 Unified National thread forms on bolts, studs, and other external threaded workpieces requiring Class 2A tolerance verification. Class 2A is the standard fit classification used for the majority of general-purpose commercial fasteners. The double-ring configuration eliminates the need to handle separate Go and No Go gages, streamlining inspection on the shop floor or at a receiving station.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDouble-ring design combines Go and No Go gages in a single unit\u003c\/li\u003e\n\u003cli\u003eThread size: 1-12 Unified National thread form\u003c\/li\u003e\n\u003cli\u003eClass 2A classification for standard commercial fastener tolerance verification\u003c\/li\u003e\n\u003cli\u003eTool steel construction for long service life and dimensional stability\u003c\/li\u003e\n\u003cli\u003eNIST traceability certification included with each unit\u003c\/li\u003e\n\u003cli\u003eMeets NIST standards for calibrated inspection tooling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for inspection of externally threaded components with a 1-12 thread size and Class 2A tolerance classification. Suitable for use in general machining, manufacturing, and mechanical assembly quality control applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThreaded ring gages are handled and applied by quality control technicians, machinists, and inspection personnel. The part being inspected should be free of chips, burrs, and cutting fluid before gaging. Apply the Go ring first; it should pass over the full thread length under its own weight or with minimal hand pressure. The No Go ring should not fully engage. Store gages in a protective case away from impact and temperature extremes to maintain calibration integrity.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1-12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassification\u003c\/strong\u003e: Class 2A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing Configuration\u003c\/strong\u003e: Double Ring (Go and No Go)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Tool Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NIST\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraceability Certification\u003c\/strong\u003e: NIST included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 2.63 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 0.7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2.165 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 41111619\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: 23-207-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51696802955570,"sku":"23-207-4","price":612.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2f88a2cb17b3889ab4e654812d9a6b8a.jpg?v=1788346411","url":"https:\/\/voomisupply.com\/products\/spi-23-207-4-threaded-ring-gage-1-12-class-2a-go-no-go","provider":"Voomi Supply","version":"1.0","type":"link"}