Bk 521-400HC Malleable Black Iron Pipe Cap 1/8 Inch

Product Description

The BK 521-400HC is a 1/8 inch malleable black iron pipe cap used to close off the end of a threaded pipe in gas, air, or fluid distribution systems. Cast from malleable black iron conforming to ANSI/ASTM A-197, this cap accepts standard NPT threads per ANSI B1.20.1. It is individually flag tagged and 100% inspected before leaving the factory. Plumbers, pipefitters, and HVAC technicians install these caps during system pressure testing, line termination, or when capping unused branch outlets on supply piping.

This fitting suits residential and light commercial plumbing and gas piping applications where a durable, threaded iron cap is required on a 1/8 inch female-threaded pipe end. It is sold individually and is appropriate for use in pipe systems where malleable iron fittings are specified by code or design.

Key Features

• Malleable black iron construction per ANSI/ASTM A-197 for strength and durability
• Threads conform to ANSI B1.20.1 NPT standard for leak-tight engagement
• Dimensions meet ANSI/ASME B16.3, B16.14, and B16.39 standards
• Individually flag tagged and 100% inspected at the factory
• Sold as a single unit for precise quantity purchasing

Compatibility

Designed as an OEM-style malleable iron fitting for standard 1/8 inch NPT threaded pipe systems in plumbing, gas distribution, and HVAC piping applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and IFGC or IPC requirements. Shut off and depressurize the pipe system fully before threading on or removing any fitting. Apply an approved thread sealant or PTFE tape to male threads before engagement. Do not over-tighten; use a pipe wrench with appropriate jaw protection to avoid damaging the fitting body.

Technical Specifications

• Material: Malleable Black Iron
• Pipe Size: 1/8 inch
• Thread Standard: ANSI B1.20.1 NPT
• Material Standard: ANSI/ASTM A-197
• Dimensional Standards: ANSI/ASME B16.3, B16.14, B16.39
• Weight: 0.056 pounds
• Sold As: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-400HC