{"product_id":"spi-34-441-6-pipe-thread-plug-gage-1-1-2-11-1-2-npt-l-1","title":"Spi 34-441-6 Pipe Thread Plug Gage 1-1\/2-11-1\/2 Npt L-1","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 34-441-6 is a tapered pipe thread plug gage designed to verify the accuracy of internal NPT threads to Class L-1 tolerance specifications. Built to ANSI B1.20.1 standards, this single-end gage checks 1-1\/2-11-1\/2 NPT threads — a common size in plumbing, HVAC piping, and industrial pipe assemblies. It ships with a NIST Traceability Certificate, making it suitable for quality control programs that require documented measurement standards. Handle Size 5 provides a comfortable grip for controlled engagement during inspection. Plumbers, pipefitters, and QC technicians use this gage to confirm that threaded fittings and pipe connections will seal properly before assembly.\u003c\/p\u003e\n\u003cp\u003eThis gage is used in field inspection, shop floor quality control, and incoming material verification for piping systems that use NPT tapered threads. The 1-1\/2-11-1\/2 thread size appears frequently in commercial plumbing headers, HVAC refrigerant piping manifolds, compressed air distribution systems, and industrial fluid handling lines. It is suited for both fabrication shops and service environments where thread integrity directly affects system pressure performance.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eChecks 1-1\/2-11-1\/2 NPT internal threads to Class L-1 tolerance per ANSI B1.20.1\u003c\/li\u003e\n  \u003cli\u003eTapered thread form matches NPT pipe thread geometry for accurate engagement verification\u003c\/li\u003e\n  \u003cli\u003eSingle-end configuration with Handle Size 5 for controlled, repeatable gage insertion\u003c\/li\u003e\n  \u003cli\u003eIncludes NIST Traceability Certificate for compliance with quality management and documentation requirements\u003c\/li\u003e\n  \u003cli\u003eConforms to ANSI B1.20.1 and NIST standards for pipe thread gaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with internal NPT tapered pipe threads sized 1-1\/2-11-1\/2, conforming to ANSI B1.20.1. Compatible with standard NPT-L1 thread gaging applications in plumbing, pipefitting, and industrial piping inspection.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread plug gages are inspection tools and are not permanently installed. Engage the gage by hand — never force it with a wrench or power tool, as this will damage the gage threads and invalidate the measurement. Before gaging, ensure the workpiece threads are clean and free of chips, burrs, or lubricant buildup that could affect readings. Gages should be stored in a protective case and recalibrated periodically to maintain traceability.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1-1\/2-11-1\/2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: NPT-L1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass\u003c\/strong\u003e: Class L-1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Configuration\u003c\/strong\u003e: Single End\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHandle Size\u003c\/strong\u003e: 5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI B1.20.1, NIST\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: 34-441-6\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51693686096178,"sku":"34-441-6","price":354.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/eb11ac7fcb3a0a513fc51c92f372daf6.jpg?v=1788316066","url":"https:\/\/voomisupply.com\/products\/spi-34-441-6-pipe-thread-plug-gage-1-1-2-11-1-2-npt-l-1","provider":"Voomi Supply","version":"1.0","type":"link"}