The B&K Products 521-203HN Black Iron Coupling is a reliable and durable fitting designed to join two pipes of equal diameter securely. Made from malleable iron with a black finish, this coupling is engineered for industrial-grade applications and is not intended for potable water systems. Its robust construction ensures long-lasting performance in demanding environments.

This coupling is ideal for transporting lubricants, oils, greases, liquefied petroleum (LP) gases, natural gases (such as nitrogen and oxygen), steam, and diesel. It is also suitable for a variety of mechanical and industrial DIY projects. The malleable iron body provides a tight seal due to the relative softness of the metal, which enhances thread engagement and leak resistance.

Threaded ends conform to ANSI/ASME B1.20.1 standards, ensuring compatibility with standard piping systems. The fitting meets ASTM and ASME standards and is rated for high-pressure applications, performing reliably up to 500 PSI at 150°F.

Key Features & Applications

• Black malleable iron construction for industrial durability.
• 150-lb class malleable fittings for robust performance.
• Rated up to 500 PSI at 150°F, suitable 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