{"product_id":"bk-521-201hn-malleable-black-iron-coupling-1-4-in","title":"Bk 521-201HN Malleable Black Iron Coupling 1\/4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe BK 521-201HN is a 1\/4-inch malleable black iron coupling designed for joining threaded pipe sections in gas, air, and general-purpose piping systems. Manufactured to ANSI\/ASTM A-197 standards for malleable iron, this fitting delivers consistent dimensional accuracy and reliable thread engagement. Threads conform to ANSI B1.20.1, and dimensional compliance meets ANSI\/ASME B16.3, B16.14, and B16.39 standards. Each fitting is individually flag tagged and 100% inspected and quality tested before shipment. Plumbers, pipefitters, and HVAC technicians working on low-pressure pipe assemblies rely on this type of fitting for straightforward inline connections on black iron systems.\u003c\/p\u003e\n\u003cp\u003eThis coupling is suited for residential and light commercial applications where threaded malleable iron fittings are specified. Typical use cases include natural gas distribution piping, compressed air lines, and general-purpose black iron pipe assemblies. The 1\/4-inch size fits standard 1\/4-inch NPT threaded pipe. It is sold individually, making it practical for service calls and small repair jobs where a single fitting is needed.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMalleable black iron construction meets ANSI\/ASTM A-197 material standard\u003c\/li\u003e\n  \u003cli\u003eThreads conform to ANSI B1.20.1 for consistent NPT fit\u003c\/li\u003e\n  \u003cli\u003eDimensional compliance with ANSI\/ASME B16.3, B16.14, and B16.39\u003c\/li\u003e\n  \u003cli\u003e100% inspected and quality tested at the factory\u003c\/li\u003e\n  \u003cli\u003eIndividually flag tagged for easy identification on the job\u003c\/li\u003e\n  \u003cli\u003e1\/4-inch size sold as a single unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting for standard 1\/4-inch NPT threaded black iron pipe systems.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by licensed plumbers or pipefitters working on threaded iron pipe systems. Shut off gas or air supply and verify zero pressure before disassembling any existing piping. Apply appropriate thread sealant or listed pipe tape to NPT threads per the system requirements and applicable code, including IFGC provisions for gas piping. Do not over-tighten malleable iron fittings, as the material can crack under excessive torque.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Malleable Black Iron\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Standard\u003c\/strong\u003e: ANSI\/ASTM A-197\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: ANSI B1.20.1 (NPT)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensional Standards\u003c\/strong\u003e: ANSI\/ASME B16.3, B16.14, B16.39\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePipe Size\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.108 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSold As\u003c\/strong\u003e: Each\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: BK\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 521-201HN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K","offers":[{"title":"Default Title","offer_id":51347008422194,"sku":"521-201HN","price":14.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310549904.jpg?v=1782096337","url":"https:\/\/voomisupply.com\/products\/bk-521-201hn-malleable-black-iron-coupling-1-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}