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Home Plumbing Rough Plumbing Supplies Pipe Fittings Black Pipe Fittings 521-803HN 1/2IN BLACK SQUARE HEAD PLUG

521-803HN 1/2IN BLACK SQUARE HEAD PLUG

PART 643602
SUPPLIER B & K LLC
SUPPLIER PART # 521-803HN
RANK A
SHELF PACK 25
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About this item

The B&K Products 521-803HN is a 1/2-inch Male Iron Pipe (MIP) Black Iron Plug designed to seal off female threaded fittings or pipes. This square head plug is part of the 150-lb class malleable fittings series and is engineered for high-pressure applications in industrial and residential systems.

Key Features:

  • Type: Square Head Plug
  • Material: Black Iron
  • Connection Type: MIP (Male Iron Pipe)
  • Size: 1/2 inch
  • Pressure Rating: Up to 500 PSI
  • Temperature Rating: Up to 150°F
  • Thread Standard: ANSI/ASME B1.20.1
  • Class: 150-lb malleable fittings
  • Seal Quality: Relative softness of metal ensures a secure seal
  • Compliance: Meets ASTM and ASME standards

Applications:

  • Lubricant systems
  • Oil and grease transport
  • Liquefied petroleum (LP) gases
  • Fuel systems
  • Natural gases (e.g., nitrogen, oxygen)
  • Steam and diesel systems

⚠️ Note: This fitting is not designed for potable water applications.

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Color Black
Nominal Size 1/2 in
Brand LDR Malleables
Model 521-803HN
Product Name 1/2-in MIP Black Iron Plug
Type Square Head Plug
Material Black Iron
Connection Type MIP (Male Iron Pipe)
Size 1/2 inch
Pressure Rating 500 PSI
Temperature Rating 150°F
Class 150-lb class malleable fittings
Thread Standard ANSI/ASME B1.20.1
Compliance Meets ASTM and ASME standards
Applications Lubricant, oil, grease, LP gases, fuel, nitrogen, oxygen, steam, diesel
Potable Water Use Not designed for potable water applications
Seal Quality Relative softness of metal helps provide a sure seal
UPC Code 032888406810
Shelf Pack 25
Minimum Order Qty 1