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Home Plumbing Rough Plumbing Supplies Pipe Fittings Black Pipe Fittings Black Caps 521-401HN 1/4IN BLACK CAP

521-401HN 1/4IN BLACK CAP

PART 862511
SUPPLIER B & K LLC
SUPPLIER PART # 521-401HN
RANK B
SHELF PACK 10
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About this item

The B&K 521-401HN is a rugged and reliable black iron cap designed to seal the end of a piping system in industrial, commercial, and residential applications. Constructed from malleable iron and finished with a protective black coating, this fitting is engineered for strength, corrosion resistance, and long-term performance in demanding environments.

Featuring a 1/4-inch Female Iron Pipe (FIP) connection, this cap is ideal for terminating pipe runs that carry non-potable fluids such as lubricants, oils, greases, liquefied petroleum (LP) gases, natural gases (including nitrogen and oxygen), steam, and diesel. It is not intended for use in potable water systems.

The cap’s threaded ends comply with ANSI/ASME B1.20.1 standards, ensuring a secure and leak-resistant seal. Rated for up to 500 PSI at 150°F, it meets ASTM and ASME specifications and is part of the 150-lb class of malleable fittings. The relative softness of the metal helps form a tight seal, making it a dependable choice for high-pressure systems.

Key Features

  • Size: 1/4 inch inlet diameter
  • Connection Type: Female Iron Pipe (FIP)
  • Material: Malleable iron
  • Finish: Black coating for corrosion resistance
  • Threading: ANSI/ASME B1.20.1 compliant
  • Pressure Ratings:
    • Working Pressure: 232 PSI
    • Maximum Pressure: 300 PSI
    • Rated up to 500 PSI at 150°F
  • Temperature Range:
    • Minimum: -20°F
    • Working: 77°F
    • Maximum: 347°F
  • Dimensions:
    • Length: 0.87 in
    • Height: 0.63 in
    • Width: 0.87 in
    • Weight: 0.049 lbs
  • Class: 150-lb malleable fittings
  • Standards: Meets ASTM and ASME standards (HHXX, FM 1140)
  • Warranty: 1-year limited warranty
  • Brand: Southland
  • Unit of Measure: Each

Applications

  • Sealing the end of non-potable piping systems
  • Transport of:
    • Lubricants
    • Oils
    • Grease
    • LP gases
    • Natural gases (e.g., nitrogen, oxygen)
    • Steam
    • Diesel
  • Industrial and commercial fluid systems
  • DIY plumbing and mechanical projects

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Color Black
Nominal Size 1/4 in
Brand LDR Malleables
Size 1/4"
Material Black Malleable Iron
Connection Type FIP
Shape Cap
Schedule Rating 150 lb class
Wall Thickness (in) 0.09
Product Length (in) 0.87
Product Width (in) 0.87
Product Height (in) 0.63
Product Weight (lbs) 0.049
Working Pressure (PSI) 232
Maximum Pressure (PSI) 300
Minimum Temperature (°F) -20
Working Temperature (°F) 77
Maximum Temperature (°F) 347
Thread Type ANSI/ASME B1.20.1
Certifications UL, FM, ASTM, ASME
Warranty 1-year limited warranty
Applications Lubricant, oil, grease, LP gases, fuel, air, natural gas, steam, DIY projects
UPC Code 032888406735
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