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Home Plumbing Rough Plumbing Supplies Pipe Fittings Black Pipe Fittings Black Couplings 521-202HN 3/8IN BLACK COUPLING

521-202HN 3/8IN BLACK COUPLING

PART 642223
SUPPLIER B & K LLC
SUPPLIER PART # 521-202HN
RANK A
SHELF PACK 10
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About this item

521‑202HN – 3/8″ Black Malleable Iron Coupling

Compact Coupling for Black Pipe Systems

The 521‑202HN is a strong, 3/8″ female-threaded coupling made from malleable black iron, designed for joining threaded steel pipes or nipples in gas, oil, air, and non-potable water systems. Built to ANSI/ASME standards, this coupling delivers durability and leak-free performance in residential, commercial, and industrial applications.

Key Features

  • Durable Malleable Iron Construction – Provides superior strength and resistance to mechanical stress.
  • Precision NPT Threads – 3/8″ female NPT threads ensure a secure, leak-proof fit with standard black steel pipe.
  • Corrosion-Resistant Black Finish – Protects against rust and maintains an industrial look.
  • High Pressure & Temperature Tolerance – Suitable for applications up to 300–500 psi and temperatures up to 350°F.

Specifications

  • Model: 521‑202HN
  • Size: 3/8″ female NPT × 3/8″ female NPT
  • Material: Malleable iron with black oxide coating
  • Length: ~1.5″
  • Weight: ~0.12 lb
  • Pressure Rating: Up to 300–500 psi
  • Temperature Rating: Up to 350°F

Applications

  • Gas & Fuel Lines – Ideal for natural gas, LP gas, and oil systems.
  • Air & Steam Systems – Handles compressed air and low-pressure steam.
  • Industrial & Residential Piping – Perfect for HVAC, plumbing (non-potable), and mechanical systems.
  • DIY & Decorative Projects – Great for industrial-style furniture and shelving.

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Brand B&K
Diameter 3/8 Inch
Inlet Connection FIP
Outlet Connection FIP
Warranty Code 1-year limited warranty
Product Type Couplings
Product Material Malleable Iron
Standards HHXX, FM1920
UPC Code 032888406889
Shelf Pack 10
Minimum Order Qty 1
Supplier Name B & K LLC
Supplier Short Name B & K /Mue
Supplier Address 1 2600 Elm Hurst Road
Supplier City Elk Grove Villa
Supplier State IL
Supplier Zip 60007
Country US
Supplier Email brett.merrick@colemanrussell.com
Supplier Url www.muellerindustries.com
Buyer Name Michael Heck
Supplier Phone (800) 782-2385
Supplier Fax (800) 421-7724
Our Customer Id 48813001
Return Policy Return to Wallace
Product Lines Valves, Faucets, Pipe Fittings
Rep Name Brett Merrick
Rep Address Rose Maria Lighthal l@ Factory
Rep Phone (800) 777-0270
Rep Cell (931) 510-7989
Rep Fax (205) 836-6528
Rep Email brett.merrick@colemanrussell.com
Rep Agency Coleman-Russell