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Home Plumbing Rough Plumbing Supplies Pipe Fittings Black Pipe Fittings Black Caps 521-406HN 1-1/4IN BLACK CAP

521-406HN 1-1/4IN BLACK CAP

PART 642738
SUPPLIER B & K LLC
SUPPLIER PART # 521-406HN
RANK B
SHELF PACK 5
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About this item

521‑406HN – 1-1/4″ Black Malleable Iron Cap

Secure End Cap for Black Pipe Systems

The 521‑406HN is a heavy-duty, 1-1/4″ 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 – 1-1/4″ 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.

Specifications

  • Model: 521‑406HN
  • Size: 1-1/4″ female NPT
  • Material: Malleable iron with black oxide coating
  • Length: ~1.375″
  • Weight: ~0.30 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 LDR Malleables
Diameter 1-1/4 Inch
Size 1-1/4" FIP
Material Black Malleable Iron
Pressure Rating Up to 500 PSI
Temperature Rating 150°F
Thread Standard ANSI/ASME B1.20.1
Compliance Standards ASTM and ASME
Class 150-lb malleable fittings
Applications Lubricant, oil, grease, LP gas, natural gases (nitrogen, oxygen), steam, diesel
Features Relative softness for secure seal; Not for potable water
UPC Code 032888406780
Shelf Pack 5
Minimum Order Qty 1