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Class 3000 Female Threaded Unions

Class 6000 Female Threaded Unions

HART Female Threaded (FNPT) O-Ring Unions made of Brass / Copper.
HART Industrial O-Ring Unions are available in female threaded end connections to suit various applications and configurations. Female Threaded end connections are available in both Class 3000 and Class 6000 union configurations and offer the same reliable, leak-free seal.
Female Threaded Unions come standard with Female NPT (National Pipe Taper) connections, but BSPT (British Standard Pipe Taper) threads are also available as a custom option. Female threads are internal threads that you would typically see on the end of a pipe or system—these mate into a corresponding male or external thread. The tapered design of the threads allows for a level of mechanical sealing without the need for a gasket, though typically pipe sealant compound (“pipe dope”) or tape is used at higher pressures.
HART’s female threaded end connections are ideal for applications where a compact seamless connection to a male threaded connection on a piece of equipment, manifold, or other system is required.
HART offers Female Threaded end connections in our Class 3000 series of unions in a wide variety of materials. HART’s Class 3000 are ideal for piping systems that are pressure rated up to 3000 psig W.O.G. Our female threaded unions are interchangeable with all of HART’s threaded and welded connections.
HART offers Female Threaded end connections in our Class 6000 series of unions in a wide variety of materials. Class 6000 female threaded unions are ideal for higher pressure applications that require connecting a female threaded union to a male threaded piping system that is pressure rated up to 6000 psig W.O.G.
Female threaded unions are ideal for a wide range of applications and industries, often including, but not limited to:
At HART, we specialize in creating high-quality unions for commercial and industrial applications. Our male and female NPT unions provide 3000 and 6000 Class services, and we also offer custom-made male and female BSPT unions. HART’s trusted Sure Seal O-ring unions ensure a tight seal even in environments with little to no pressure.
Along with our male and female threaded unions, we manufacture buttweld unions, socketweld unions, dielectric insulated unions, hammer lug unions, and more. Choose from interchangeable ends and fitting types, metal and seal materials, sizes, and pressure ratings. HART utilizes stainless and carbon steel, brass, aluminum, hastelloy, and Monel 400 to meet your high-pressure pipe union needs.
To learn more about our Engineering and Manufacturing Capabilities, visit our CAPABILITIES
Our team is here to answer any questions about our available inventory, production processes, and adherence to regulatory standards. Contact us today to start your order.

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