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Home Plumbing Rough Plumbing Supplies Pipe Fittings Black Pipe Fittings 521-403HN 1/2IN BLACK CAP

521-403HN 1/2IN BLACK CAP

PART 642681
SUPPLIER B & K LLC
SUPPLIER PART # 521-403HN
RANK A
SHELF PACK 25
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About this item

521‑403HN – 1/2″ Black Malleable Iron Cap

Secure End Cap for Black Pipe Systems

The 521‑403HN is a heavy-duty, 1/2″ female-threaded cap made from malleable black iron, designed to seal the end of a threaded steel pipe in gas, oil, air, and non-potable water systems. Built to ANSI/ASME standards, this cap ensures 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 – 1/2″ female NPT threads ensure a secure, leak-proof seal.
  • 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.
  • Standards Compliance – Threads per ANSI/ASME B1.20.1; dimensions per ANSI/ASME B16.3, B16.14, B16.39.

Specifications

  • Model: 521‑403HN
  • Size: 1/2″ female NPT
  • Material: Malleable iron with black oxide coating
  • Length: ~1.0″
  • 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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Diameter 1/2 Inch
Brand LDR Malleables
Fitting Type Cap
Size 1/2 inch
Material Malleable Iron
Finish Black
Connection Type FIP (Female Threaded)
Pressure Rating 500 PSI at 150°F
Thread Standard ANSI/ASME B1.20.1
Class 150
Standards ASTM, ASME
UPC Code 032888406759
Shelf Pack 25
Minimum Order Qty 1