{"product_id":"spi-34-399-6-plug-thread-gage-1-2-13-2b-double-end","title":"Spi 34-399-6 Plug Thread Gage 1\/2-13 2B Double End","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 34-399-6 is a double-end plug thread gage designed to verify 1\/2-13 UNC internal threads to a 2B tolerance class. One end carries the Go member to confirm the thread will accept a mating fastener; the opposite end carries the No Go member to confirm the thread has not been cut oversize. The gage is machined from steel for wear resistance and dimensional stability. A size 2 handle is included. The tool ships with a traceability certification traceable to NIST standards, supporting documented quality control programs in manufacturing, maintenance, and inspection environments.\u003c\/p\u003e\n\u003cp\u003eThe 34-399-6 is used in machine shops, production floors, and field maintenance settings wherever 1\/2-13 tapped holes must be verified before assembly. Typical applications include confirming thread quality in structural fastener holes, pipe-fitting flanges, equipment frames, and mechanical sub-assemblies. Machinists, quality inspectors, and maintenance technicians reach for this gage when a visual check is not sufficient and a pass\/fail thread verification is required to meet print or specification tolerances.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eDouble-end design provides Go and No Go members in a single tool\u003c\/li\u003e\n  \u003cli\u003eCalibrated to 1\/2-13 UNC thread form at 2B tolerance class\u003c\/li\u003e\n  \u003cli\u003eSteel construction for durability and dimensional stability under repeated use\u003c\/li\u003e\n  \u003cli\u003eSize 2 handle included — no separate handle purchase required\u003c\/li\u003e\n  \u003cli\u003eNIST-traceable certification included to support quality documentation and audit requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned to inspect 1\/2-13 UNC internal threads cut to a 2B tolerance class in any material or application where that thread form is specified.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread gages are inspection tools, not cutting tools — they should be hand-turned only and never forced. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain calibration accuracy. Periodic recalibration against a reference standard is recommended to ensure continued measurement reliability, especially in high-cycle inspection environments. Store the gage in its case or a protected location to prevent contact damage to the thread members.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-13\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Class\u003c\/strong\u003e: 2B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGage Type\u003c\/strong\u003e: Go \/ No Go\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Configuration\u003c\/strong\u003e: Double End\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHandle Size\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHandle Included\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTraceability Certification\u003c\/strong\u003e: NIST\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\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: 34-399-6\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51704333861170,"sku":"34-399-6","price":185.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9773b6a1b2eeda896fe88798074add97.jpg?v=1788421972","url":"https:\/\/voomisupply.com\/products\/spi-34-399-6-plug-thread-gage-1-2-13-2b-double-end","provider":"Voomi Supply","version":"1.0","type":"link"}