The B&K 511-700HC Union is a compact, high-strength fitting designed to join two sections of threaded pipe in a straight line while allowing easy disassembly for maintenance or repair. Made from hot-dipped galvanized malleable iron, this union offers excellent corrosion resistance and mechanical durability, making it ideal for both indoor and outdoor applications.

This union features female iron pipe (FIP) threads on both ends and is manufactured to meet ANSI B1.20.1, ASME B16.39, and ASTM A197/A197M standards. It is rated for 300 PSI in liquid and gas systems and 150 PSI in steam applications. The union is suitable for use in a wide range of systems including potable water, natural gas, oil, steam, and air.

Key Features

• Model: 511-700HC
• Size: 1/8 inch FIP x FIP
• Material: Hot-dipped galvanized malleable iron
• Finish: Zinc coating for enhanced corrosion resistance
• Connection Type: Threaded FIP x FIP (Female Iron Pipe)
• Class: 150
• Pressure Ratings:
  • Liquid & Gas: Up to 300 PSI
  • Steam: Up to 150 PSI
• Temperature Range: -20°F to 350°F
• Standards Compliance:
  • ANSI B1.20.1 (Threading)
  • ASME B16.39 (Fitting Dimensions)
  • ASTM A197/A197M (Material Specification)
• Certifications:
  • NSF/ANSI 61 & 372 – Lead-free and safe for potable water
  • UL Listed
  • FM Approved
• Dimensions:
  • Overall Length: 1.25 inches
  • Outside Diameter: 0.25 inches
  • Weight: Approx. 0.15–0.16 lbs
• Country of Origin: China
• Warranty: 1-Year Manufacturer Warranty

Applications

• Potable Water Systems – Certified lead-free for safe drinking water use
• Natural Gas Lines – UL and FM listed for gas applications
• Oil & Fuel Systems – Suitable for low- to medium-pressure fuel transport
• Steam Systems – Rated for up to 150 PSI steam pressure
• Air Compression Systems – Reliable sealing in pneumatic setups
• Industrial & Mechanical Systems – Ideal for fluid and gas transport in utility piping
• Maintenance Access Points – Allows easy disconnection for cleaning or repairs
• DIY & Decorative Projects – Popular in custom furniture and industrial-style builds