4 in x 1-1/2 in 304 Stainless Steel Threaded Hexagon Bushing - Durable

In this review the 4 in x 1-1/2 in 304 Stainless Steel Threaded Hexagon Bushing is evaluated for professionals who need a reliable reducing bushing for threaded pipe connections. The bottom line: this Class 150, MNPT x FNPT fitting earns its place when corrosion resistance and standardized threads matter most. It is a straightforward component that brings the durability of 304 stainless steel and the confidence of ANSI B1.20.1 compatible threads to hydraulic, pneumatic and plumbing installations where a hexagon body makes tightening and removal simple with wrenches.

Key Features

• Threaded Hexagon Bushing: Provides a compact way to reduce pipe size without welding, simplifying repairs and retrofit work.
• MNPT x FNPT configuration: Ensures compatibility with common male and female national pipe threads for easy integration into existing systems.
• Material Grade 304: Offers good corrosion resistance for general industrial and plumbing environments where stainless is preferred.
• Class 150 rating: Matches moderate pressure applications typical of standard piping and plumbing systems.
• ANSI B1.20.1 compliance: Threads conform to a widely used standard, reducing the risk of cross-threading or mismatch during installation.

Who It's For

This bushing is aimed at plumbers, maintenance techs, and fabricators who work with threaded galvanized or stainless pipe and need a durable reducing fitting that will not require special adapters. It is practical on job sites and in plant maintenance where a hex body allows secure wrenching.

Those who need high-pressure fittings beyond Class 150, specialty alloys for extreme corrosion or food-grade polishing should look elsewhere, since this part is specified as 304 stainless and rated to Class 150 service only.

Pros & Cons

Pros

• Stainless 304 construction resists general corrosion and suits a wide range of industrial and plumbing uses.
• MNPT x FNPT threading with ANSI B1.20.1 compatibility makes it easy to match with standard threaded components.
• Hexagon body design simplifies tightening and removal with common tools, saving time on installation.

Cons

• Class 150 rating limits use to moderate pressure systems and is not intended for high-pressure industrial applications.

Specifications

Fitting Type	Threaded Hexagon Bushing
Size	4 in x 1-1/2 in
Thread Type	MNPT x FNPT (ANSI B1.20.1)
Material Grade	304 Stainless Steel
Class	Class 150
Standards	Meets ANSI B1.20.1 Standards

Our Verdict

The 4 in x 1-1/2 in 304 Stainless Steel Threaded Hexagon Bushing is a practical, value-oriented choice for routine plumbing and industrial work where standard threaded connections and corrosion resistance matter. It is best for installers who need reliable 304 stainless fittings with a hex body for easy wrenching, while teams with high-pressure or specialty alloy needs should consider alternatives.

Frequently Asked Questions

Is this fitting compatible with standard NPT pipe?
Yes. Threads are MNPT x FNPT and conform to ANSI B1.20.1, so it mates with standard NPT threaded pipe.

Can this bushing be used outdoors?
Yes. 304 stainless provides good corrosion resistance for typical outdoor and industrial environments, though more corrosive settings may require higher alloy grades.

What pressure class is this bushing rated for?
It is specified as Class 150, suitable for moderate pressure piping systems but not for high-pressure applications.