{"product_id":"spi-34-388-9-plug-thread-gage-3-8-16-3b-double-end-go-no-go","title":"Spi 34-388-9 Plug Thread Gage 3\/8-16 3B Double End Go No Go","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 34-388-9 is a double-end plug thread gage used to verify internal thread compliance on 3\/8-16 UNC fastener holes. One end carries the Go member; the opposite end carries the No Go member. The Go end must pass fully through an acceptable thread, while the No Go end must not enter beyond two turns. Manufactured from steel and supplied with a size 2 handle, this gage is traceable to NIST standards, making it suitable for quality control work on production floors, in machine shops, and in field inspection environments. Machinists, QC inspectors, and precision tradespeople are the primary users.\u003c\/p\u003e\u003cp\u003eThis gage is used wherever 3\/8-16 internal threads must be verified for conformance to Class 3B tolerance requirements. Class 3B designates a tight-tolerance fit, commonly specified in aerospace, automotive, and industrial fastener applications where thread engagement precision is critical. The double-end configuration consolidates Go and No Go inspection into a single tool, reducing changeover time during high-volume inspection runs. A handle is included, so no separate handle purchase is required.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDouble-end design combines Go and No Go members in one tool\u003c\/li\u003e\n\u003cli\u003eClass 3B tolerance rating for tight-fit internal thread inspection\u003c\/li\u003e\n\u003cli\u003eNIST-traceable calibration certification included\u003c\/li\u003e\n\u003cli\u003eSteel construction for durability and dimensional stability\u003c\/li\u003e\n\u003cli\u003eSize 2 handle included — ready to use out of the package\u003c\/li\u003e\n\u003cli\u003eConforms to NIST standards for thread gage measurement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for inspection of 3\/8-16 UNC internal threads to Class 3B tolerance specifications. Confirm thread form, pitch, and tolerance class before use.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThread gages do not require installation in a mechanical system, but proper handling is essential to maintain calibration accuracy. Store the gage in its case when not in use and avoid dropping or contacting the gage members with abrasive surfaces. Clean threads in the workpiece before gaging to prevent debris from causing false rejections. Recalibrate or re-certify the gage at intervals specified by your quality management program or applicable inspection standards.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Class\u003c\/strong\u003e: 3B\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\u003eStandards\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\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: 34-388-9\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51691992187186,"sku":"34-388-9","price":161.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e9fa15ae845654dc7e75714b1ccdc05d.jpg?v=1788291824","url":"https:\/\/voomisupply.com\/products\/spi-34-388-9-plug-thread-gage-3-8-16-3b-double-end-go-no-go","provider":"Voomi Supply","version":"1.0","type":"link"}