{"product_id":"spi-23-191-0-threaded-ring-gage-5-8-24-unef-class-2a","title":"Spi 23-191-0 Threaded Ring Gage 5\/8-24 Unef Class 2A","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 23-191-0 is a double-ring threaded ring gage used to verify the dimensional accuracy of externally threaded fasteners and components cut to a 5\/8-24 UNEF thread form. This set includes both a Go ring and a No Go ring in a single unit, allowing technicians to confirm that a threaded part falls within the acceptable tolerance band for Class 2A fit. Manufactured from tool steel, the gage provides the hardness and wear resistance required for repeated use in production and inspection environments. Calibrated to NIST-traceable standards, it is suited for quality control, incoming inspection, and shop-floor thread verification.\u003c\/p\u003e\n\u003cp\u003eThis gage is used wherever 5\/8-24 UNEF external threads must be verified to Class 2A tolerance — a fit classification common in aerospace, firearms, precision mechanical assemblies, and instrumentation components. The Go ring confirms that the thread is not undersized or misformed, while the No Go ring confirms the thread is not oversized. Both functions are contained in one double-ring body, reducing the number of individual tools required at an inspection station. Machinists, quality technicians, and toolroom personnel are the primary users.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eGo and No Go rings combined in a single double-ring gage body\u003c\/li\u003e\n  \u003cli\u003eThread size: 5\/8-24 UNEF for external thread inspection\u003c\/li\u003e\n  \u003cli\u003eClass 2A tolerance classification for standard-fit external threads\u003c\/li\u003e\n  \u003cli\u003eTool steel construction for durability and long service life\u003c\/li\u003e\n  \u003cli\u003eCalibrated to NIST-traceable standards for traceable inspection records\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for inspection of externally threaded workpieces with a 5\/8-24 UNEF thread form manufactured to Class 2A tolerance specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThreaded ring gages are handled and stored by quality technicians and toolroom personnel, not installed in a system. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the tool steel surfaces. Do not force the gage onto a thread — excessive resistance on the Go ring indicates the thread is out of tolerance and should be evaluated before proceeding. Periodic re-calibration against NIST-traceable masters is recommended to maintain inspection integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/8-24\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: UNEF\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 and No Go (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\u003eWidth\u003c\/strong\u003e: 2.19 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 0.58 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.236 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 41111619\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: 23-191-0\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51712801177906,"sku":"23-191-0","price":453.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/72ea2ea7a59ca3558a35e5dfbefb768f.jpg?v=1788488707","url":"https:\/\/voomisupply.com\/products\/spi-23-191-0-threaded-ring-gage-5-8-24-unef-class-2a","provider":"Voomi Supply","version":"1.0","type":"link"}