Bk 521-941BG Black Iron Hex Bushing 3/4 X 1/4 Inch

Product Description

The BK 521-941BG is a black malleable iron hex bushing used to reduce pipe size in threaded piping systems. It features a 3/4 inch male NPT thread on the larger end and a 1/4 inch female NPT thread on the smaller end. The hexagonal body provides wrench flats for secure installation and removal. Each fitting meets ANSI/ASTM A-197 material standards and ANSI/ASME B16.14 and B16.39 dimensional standards, with threads conforming to ANSI B1.20.1. Plumbers, pipefitters, and gas line technicians install these fittings in black iron piping systems for residential and light commercial applications.

This hex bushing is suited for black iron gas distribution lines, compressed air systems, and general-purpose threaded pipe assemblies. The fitting transitions from a 3/4 inch pipe tap down to a 1/4 inch female port, making it common at appliance connections, gauge ports, and branch take-offs. Each unit is individually flag tagged and 100 percent inspected and quality tested before shipment. The Mueller logo is cast into the body of the fitting as a manufacturer identifier.

Key Features

• Black malleable iron construction per ANSI/ASTM A-197
• 3/4 inch male NPT x 1/4 inch female NPT hex bushing configuration
• Hexagonal body provides full wrench engagement for installation
• Threads conform to ANSI B1.20.1 for reliable leak-free assembly
• Dimensions meet ANSI/ASME B16.14 and B16.39 standards
• 100 percent inspected and quality tested; individually flag tagged

Compatibility

Designed as an OEM-style replacement or standard-service fitting for threaded black iron pipe systems using 3/4 inch and 1/4 inch NPT connections.

Installation Notes

Installation is performed by licensed plumbers or gas fitters working with threaded black iron piping systems. Shut off and depressurize the gas or fluid line completely before making any fitting changes. Apply an approved thread sealant or PTFE tape rated for the service medium to all male threads before assembly. Follow applicable IFGC or IPC requirements for the specific system type and local jurisdiction.

Technical Specifications

• Material: Black malleable iron, ANSI/ASTM A-197
• Male Thread Size: 3/4 inch NPT
• Female Thread Size: 1/4 inch NPT
• Thread Standard: ANSI B1.20.1
• Dimensional Standard: ANSI/ASME B16.14, B16.39
• Weight: 0.157 pounds
• Unit of Measure: Each
• Minimum Order Quantity: 5

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-941BG