Bk 521-801HN Malleable Black Iron Pipe Plug 0.25 in

Product Description

The BK 521-801HN is a 1/4-inch malleable black iron pipe plug designed for sealing threaded pipe openings in gas, water, and general plumbing systems. Manufactured from black malleable iron meeting ANSI/ASTM A-197 material standards, this plug is individually flag tagged for easy identification. Threads conform to ANSI B1.20.1 for reliable, leak-resistant engagement. Dimensional compliance with ANSI/ASME B16.14 and B16.39 ensures consistent fitment across standard pipe fittings. Each plug is 100 percent inspected and quality tested before leaving the facility. Installed by licensed plumbers and pipefitters in both residential and commercial applications.

This plug is suited for use in low-pressure and standard-pressure piping systems where a threaded port needs to be capped or temporarily sealed. Typical applications include sealing unused tee outlets, capping test ports, and closing off pipe ends during installation or maintenance. The black iron finish makes it appropriate for gas line assemblies and non-potable water systems. The 1/4-inch NPT thread size fits standard 1/4-inch female threaded fittings and pipe ends.

Key Features

• Black malleable iron construction per ANSI/ASTM A-197 for durability in piping systems
• Threads comply with ANSI B1.20.1 for leak-resistant, standard NPT engagement
• Dimensions meet ANSI/ASME B16.14 and B16.39 standards
• 100 percent inspected and quality tested
• Individually flag tagged for easy trade identification and inventory

Compatibility

Designed as an OEM-style replacement or standard service fitting for 1/4-inch NPT threaded pipe systems in gas, plumbing, and mechanical piping applications.

Installation Notes

Installation is performed by a licensed plumber or pipefitter following applicable IPC or IFGC code requirements. Shut off gas or water supply and depressurize the line before installing or removing any threaded fitting. Use appropriate pipe thread sealant or PTFE tape on male threads unless the fitting is intended for a dry-fit test application. Do not overtighten; hand-tighten and apply additional turns with a wrench to avoid cracking the fitting or damaging the threads.

Technical Specifications

• Material: Malleable Black Iron
• Thread Size: 1/4 inch NPT
• Thread Standard: ANSI B1.20.1
• Dimensional Standard: ANSI/ASME B16.14, B16.39
• Material Standard: ANSI/ASTM A-197
• Weight: 0.05 pounds
• Unit of Measure: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-801HN