The B&K Products 521-208HN Black Iron Coupling is a robust and dependable fitting designed to securely connect two pipes of equal diameter. Constructed from malleable iron and finished in black, this coupling is engineered for strength and durability in demanding environments. It is not intended for potable water applications but excels in industrial and mechanical systems where reliability is paramount.

This coupling is ideal for transporting lubricants, oils, greases, liquefied petroleum (LP) gases, natural gases (such as nitrogen and oxygen), steam, and diesel. Its malleable iron body provides a secure seal due to the relative softness of the metal, which enhances thread engagement and leak resistance. The fitting is rated for high-pressure systems and performs reliably up to 500 PSI at 150°F.

Threaded ends conform to ANSI/ASME B1.20.1 standards, ensuring compatibility with standard piping systems. It also meets ASTM and ASME standards, making it a trusted choice for professionals in plumbing, HVAC, and industrial maintenance.

Key Features & Applications

• Black malleable iron construction for strength and durability.
• 150-lb class malleable fittings suitable for industrial-grade applications.
• Rated up to 500 PSI at 150°F, ideal for high-pressure systems.
• Threaded ends comply with ANSI/ASME B1.20.1 standards for secure connections.
• Meets ASTM and ASME standards for quality assurance.
• Ideal for:
  • Lubricant transport
  • Oil and grease systems
  • LP and natural gas lines
  • Steam systems
  • Diesel fuel systems
  • DIY mechanical projects