Bk 521-932BG Black Iron Hex Bushing 1/2 X 3/8 Inch

Product Description

The BK 521-932BG is a black malleable iron hex bushing used to reduce pipe thread sizes in gas, air, and general plumbing systems. It features a 1/2 inch male NPT thread on the larger end and a 3/8 inch female NPT thread on the smaller end, allowing a larger-diameter pipe or fitting to connect to a smaller downstream component. Weighing 0.067 pounds, this compact fitting is individually flag tagged for identification. The Mueller logo is cast into the body. Each fitting is 100 percent inspected and quality tested before shipment.

This hex bushing is suited for residential and light commercial piping applications including gas distribution lines, compressed air systems, and water supply rough-in work. The hexagonal body profile allows a wrench to apply proper torque during installation. Plumbers, pipefitters, and HVAC technicians commonly use bushings like this when transitioning between pipe sizes at valves, regulators, meters, or appliance connections.

Key Features

• 1/2 inch male NPT x 3/8 inch female NPT hex bushing configuration
• Black malleable iron construction per ANSI/ASTM A-197
• Dimensions conform to ANSI/ASME B16.15, B16.14, and B16.39
• Threads cut to ANSI B1.20.1 standard for reliable sealing
• Hexagonal body allows full wrench engagement during installation
• Individually flag tagged and 100 percent inspected

Compatibility

Designed as an OEM-style malleable iron pipe fitting for use in standard NPT threaded piping systems where a 1/2 inch to 3/8 inch thread reduction is required.

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 line before making or breaking any threaded connection. Apply an appropriate thread sealant or PTFE tape rated for the service medium before threading the bushing into the female fitting. Do not over-tighten; use a pipe wrench on the hex body only.

Technical Specifications

• Material: Black malleable iron, ANSI/ASTM A-197
• Male Thread Size: 1/2 inch NPT
• Female Thread Size: 3/8 inch NPT
• Thread Standard: ANSI B1.20.1
• Dimensional Standard: ANSI/ASME B16.15, B16.14, B16.39
• Weight: 0.067 pounds
• Sold As: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-932BG