Bk 521-207BG Malleable Black Iron Coupling 1-1/2 in

Product Description

The BK 521-207BG is a 1-1/2 inch malleable black iron coupling designed for joining threaded pipe sections in gas, air, and general-purpose piping systems. Manufactured to ANSI/ASTM A-197 material standards with dimensions conforming to ANSI/ASME B16.3, B16.14, and B16.39, this coupling delivers consistent thread engagement per ANSI B1.20.1. Each fitting is individually flag tagged and 100% inspected and quality tested before leaving the facility. Plumbers, pipefitters, and HVAC technicians working with black iron pipe will find this coupling sized and threaded to standard specifications for reliable field installation.

This coupling is suited for residential and light commercial piping applications where malleable black iron fittings are required. Typical uses include natural gas distribution lines, compressed air systems, and other general-purpose threaded pipe assemblies where a straight in-line connection between two pipe ends is needed. The fitting is sold individually and is compatible with standard NPT-threaded black iron pipe.

Key Features

• Malleable black iron construction meeting ANSI/ASTM A-197 material specification
• Dimensions conform to ANSI/ASME B16.3, B16.14, and B16.39
• Threads cut to ANSI B1.20.1 NPT standard for consistent fit
• 100% inspected and quality tested at the factory
• Individually flag tagged for easy identification in the field
• Sold as a single unit — no minimum order required beyond one piece

Compatibility

Designed as a standard OEM-style replacement or new-installation fitting for 1-1/2 inch NPT malleable black iron pipe systems in residential and commercial applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter following applicable local codes and IFGC requirements when used on gas lines. Shut off all gas or system pressure and verify zero pressure before disassembling or installing any threaded fitting. Apply an approved thread sealant or PTFE tape rated for the service medium before making up the joint. Hand-tighten first, then use a pipe wrench to bring the joint to a properly engaged thread count without over-stressing the fitting.

Technical Specifications

• Material: Malleable Black Iron
• Material Standard: ANSI/ASTM A-197
• Dimension Standard: ANSI/ASME B16.3, B16.14, B16.39
• Thread Standard: ANSI B1.20.1
• Pipe Size: 1-1/2 inches
• Weight: 0.938 pounds
• Unit of Measure: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-207BG