Bk 521-975BG Black Iron Hex Bushing 1-1/2 X 1 In.

Product Description

The BK 521-975BG is a black malleable iron hex bushing designed to reduce a 1-1/2 inch male NPT pipe thread down to a 1 inch female NPT thread. This type of fitting is a standard component in gas, air, and low-pressure fluid piping systems. The hexagon body profile allows for wrench engagement during installation. Each fitting is individually flag tagged and carries the Mueller logo cast directly into the body. Material conforms to ANSI/ASTM A-197, dimensions conform to ANSI/ASME B16.14 and B16.39, and threads are cut to ANSI B1.20.1. Plumbers and pipefitters use this bushing wherever a threaded pipe run requires a reduction in nominal pipe size at a fitting connection point.

This hex bushing is suited for residential and light commercial piping applications including gas supply lines, compressed air distribution, and water service piping. The 1-1/2 inch male thread connects into a larger fitting or valve body, while the 1 inch female thread receives the smaller downstream pipe or fitting. Its malleable iron construction provides the ductility needed to withstand mechanical stress in threaded assemblies. This fitting is sold individually and ships as a single unit.

Key Features

• Black malleable iron construction conforming to ANSI/ASTM A-197
• 1-1/2 inch male NPT x 1 inch female NPT reduction
• Hexagon body allows standard wrench engagement for proper tightening
• Threads cut to ANSI B1.20.1 for consistent fitment with standard NPT pipe and fittings
• Dimensions comply with ANSI/ASME B16.14 and B16.39
• 100 percent inspected and quality tested before shipment

Compatibility

Designed as an OEM-style replacement or new-installation fitting compatible with standard 1-1/2 inch male NPT and 1 inch female NPT threaded pipe systems using black iron or malleable iron components.

Installation Notes

Installation is performed by licensed plumbers or pipefitters in accordance with applicable local codes and IFGC or IPC requirements depending on service type. Shut off and depressurize the piping system fully before disassembling any threaded connections. Apply an appropriate thread sealant or PTFE tape to the male threads before assembly. Do not over-torque; use the hex body with a fitting wrench to achieve a proper sealed connection without cracking the fitting.

Technical Specifications

• Material: Black Malleable Iron, ANSI/ASTM A-197
• Connection Size (Male): 1-1/2 inches NPT
• Connection Size (Female): 1 inch NPT
• Thread Standard: ANSI B1.20.1
• Dimension Standards: ANSI/ASME B16.14, B16.39
• Weight: 0.147 pounds
• Sold As: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-975BG