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Home Plumbing Rough Plumbing Supplies Pipe Fittings Black Pipe Fittings Black Caps 501414 3/8 BLACK CAP

501414 3/8 BLACK CAP

PART 642673
SUPPLIER CODA RESOURCES DBA STZ IND
SUPPLIER PART # 501414
RANK A
SHELF PACK 10
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About this item

521‑402HN – 3/8″ Black Malleable Iron Cap

Secure End Cap for Black Pipe Systems

The 521‑402HN is a heavy-duty, 3/8″ 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 – 3/8″ 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: 521‑402HN
  • Size: 3/8″ female NPT
  • Material: Malleable iron with black oxide coating
  • Length: ~1.0″
  • Weight: ~0.10 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 3/8 Inch
Brand LDR Malleables
Fitting Type Cap
Size 3/8 inch
Material Malleable Iron
Finish Black Oxide
Connection Type FIP (Female Threaded)
Pressure Class 150 lb
Pressure Rating 300 PSI
Thread Standard ANSI/ASME B1.20.1
Standards ASTM A153, ASME B16.3
Temperature Rating -20°F to 150°F
UPC Code 019442146856
Shelf Pack 10
Minimum Order Qty 1
Supplier Name CODA RESOURCES DBA STZ INDUSTRIES
Supplier Short Name Coda Reso
Supplier Address 1 P.O. Box 6631
Supplier City 990 East North Ave Glendale Heights
Supplier State IL
Supplier Zip 60148
Country US
Supplier Email info@codaresources.com
Supplier Url www.codaresources.com
Buyer Name Michael Heck
Supplier Phone 718-485-4403
Supplier Fax (773) 265-3130
Also Known As STZ Ind
Drop Ship Order Min $2500
Return Policy Contact Factory for RGA
Rep Name Jimmy Tubbs
Rep Address 1420 Donelson Pike B6 Nashville, TN 37217
Rep Phone 615-331-8611
Rep Fax 615-832-8669
Rep Email jimmytubbs@gmail.com