{"product_id":"spi-23-137-3-threaded-ring-gage-6-40-class-2a-go-no-go","title":"Spi 23-137-3 Threaded Ring Gage 6-40 Class 2A Go No Go","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 23-137-3 is a double-ring threaded ring gage designed to inspect external threads to the 6-40 Unified National thread standard at Class 2A tolerances. It includes both a Go ring and a No Go ring in a single double-ring configuration, allowing technicians to verify that male-threaded fasteners and components fall within the specified tolerance range in one efficient step. Constructed from tool steel for durability and dimensional stability, this gage ships with NIST traceability certification, supporting quality assurance and calibration documentation requirements in precision manufacturing and inspection environments.\u003c\/p\u003e\n\u003cp\u003eThis gage is used in machine shops, precision manufacturing facilities, quality control labs, and production environments where 6-40 threaded components must be verified against Class 2A fit specifications. It is appropriate for inspecting small-diameter fasteners, machine screws, and threaded inserts common in electronics, instrumentation, and light mechanical assemblies. The NIST traceability certificate makes it suitable for controlled inspection processes and audited quality systems.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eGo and No Go rings in a single double-ring body for complete Class 2A thread inspection\u003c\/li\u003e\n  \u003cli\u003eThread size: 6-40 Unified National thread form\u003c\/li\u003e\n  \u003cli\u003eClass 2A tolerance classification for standard external thread inspection\u003c\/li\u003e\n  \u003cli\u003eTool steel construction for long service life and dimensional stability\u003c\/li\u003e\n  \u003cli\u003eIncludes NIST traceability certification for calibration and quality documentation\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.118 pounds for easy bench use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for inspection of external 6-40 Unified National threads machined to Class 2A tolerances, including machine screws, threaded fasteners, and small-diameter threaded components in that thread form and classification.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread ring gages are used by quality control inspectors and machinists and require no installation in the traditional sense. Store gages in a clean, dry environment and handle with care to avoid nicks or contamination that could affect accuracy. Clean threads on both the gage and the workpiece before inspection. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 6-40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClassification\u003c\/strong\u003e: Class 2A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGage Type\u003c\/strong\u003e: Go \/ No Go\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRing Configuration\u003c\/strong\u003e: Double Ring\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: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 0.27 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.118 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: 23-137-3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51691336171826,"sku":"23-137-3","price":299.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6341001bd77f5951586e5f45475051e9.jpg?v=1788283447","url":"https:\/\/voomisupply.com\/products\/spi-23-137-3-threaded-ring-gage-6-40-class-2a-go-no-go","provider":"Voomi Supply","version":"1.0","type":"link"}