B K/mueller 521-910HC Black Hex Bushing 1/4x1/8

Product Description

The B K/MUELLER INDS(IMPORT) 521-910HC is a black hex bushing used to reduce a larger threaded pipe opening to a smaller one. Sized at 1/4 inch male NPT to 1/8 inch female NPT, this fitting installs in gas, air, and plumbing distribution systems where a threaded size reduction is needed. The hex head allows standard wrench engagement for consistent makeup torque. With a package quantity of 35 pieces per unit, this bushing is well-suited for contractors stocking common transition fittings on service trucks or job sites. Plumbers, pipefitters, and HVAC technicians regularly use hex bushings when adapting pressure gauges, valves, or branch tees to existing pipe runs.

This hex bushing fits typical residential and light commercial piping applications. It is used when connecting smaller-diameter threaded components into 1/4 inch NPT ports, or when stepping down from 1/4 inch pipe to 1/8 inch instrumentation or gas line connections. Common install scenarios include adapting pressure gauge ports, gas manifold taps, and pneumatic line fittings. The black finish indicates standard black iron or black-coated construction appropriate for gas piping systems in addition to general mechanical applications.

Key Features

• 1/4 inch male NPT to 1/8 inch female NPT threaded reduction
• Black finish suitable for gas piping and general mechanical applications
• Hex head design allows full wrench engagement for proper thread makeup
• Sold in a package quantity of 35 pieces for job-site or truck stock use

Compatibility

Designed as an OEM-style replacement and general-use hex bushing for 1/4 inch to 1/8 inch NPT threaded pipe systems in residential and commercial plumbing, gas, and HVAC applications.

Installation Notes

Installation is typically performed by a licensed plumber, pipefitter, or HVAC technician following applicable code requirements including IFGC and IPC. Always shut off gas or fluid supply and relieve system pressure before replacing or adding threaded fittings. Apply an approved pipe thread sealant or thread tape rated for the service medium before makeup. Do not overtighten; use a wrench on the hex head rather than the connected component body to avoid stress cracking downstream fittings.