Hex Reducer Bushing Pipe Fitting: High-Integrity Thread Reducer

Create a secure, space-saving connection between mismatched thread sizes. The Stark Hex Bushing is a male-to-female thread reducer, engineered to allow a smaller male-threaded pipe or component to be installed into a larger female-threaded port. Machined from a single piece of forged 316/316L stainless steel, it provides a robust, leak-free transition, making it the ideal solution for instrument installation, manifold customization, and system retrofitting.

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✓ One-Piece Forged Body| ✓ Compact Thread Reduction| ✓ High-Pressure Rated

🔧 Configure Your Hex Bushing in Seconds

Find your required fitting by selecting the thread types and sizes.

1. Select Your Thread Type:

○ NPT (High-Pressure Process Standard)
○ BSPT (R) (ISO Tapered - General Industrial)
○ BSPP (G) (Parallel - Leak-Free Soft Seal)
○ Metric / SAE (OEM & Hydraulic Specialty)

2. Select Your Thread Sizes (Male x Female)

🔥 Most Popular Sizes (In Stock - Same Day Shipping)

1/4" x 1/8" NPT	1/2" x 1/4" NPT	3/4" x 1/2" NPT	1" x 3/4" NPT
SS-TRB-MN4-FN2	SS-TRB-MN8-FN4	SS-TRB-MN12-FN8	SS-TRB-MN16-FN12
[Add to Quote]	[Add to Quote]	[Add to Quote]	[Add to Quote]

Part Number Format: [Material]-TRB-[Thread1]-[Thread2] (e.g., INC625-TRB-MN4-FN2)

(TRB = Hex Reducer Bushing)

🛠 The Engineering Advantage

Superior Strength with One-Piece Forging: Unlike multi-piece or cast alternatives, our hex bushings are machined from forged316L stainless steel. This provides a superior grain structure that offers higher strength and resistance to cracking under high installation torque and system pressure.

Compact, Low-Profile Design: The bushing design offers the most compact and space-saving method for reducing a thread size, sitting nearly flush with the port it is installed into.

Precision-Machined Threads for a Perfect Seal: Our male and female NPT and BSPT tapered threads are machined to exacting ASME and ISO standards. This ensures perfect thread engagement and a secure, leak-free seal on both connections when properly installed with thread sealant.

Guaranteed Material Integrity: Every Stark pipe fitting comes with full material traceability. We provide a Material Test Report (MTR) to EN 10204 3.1and PMI verification as standard, giving you absolute confidence in the material you are installing.

📈 Technical Specifications

Feature	Stark Standard Specification
Body Material	Forged 316/316L Stainless Steel
Thread Types	NPT, BSPT (R), BSPP (G), Metric / SAE
Pressure Rating	Up to 20,000 PSI (1378 bar), varies by size
Compliance	MTR to EN 10204 3.1 & PMI Verified
Configurations	A wide range of Male x Female reducing sizes

🎯 Why Choose a Stark Hex Bushing? A Head-to-Head Comparison

Feature	Using a Bell Reducer + Nipple	Using Stark Forged Hex Reducer Bushing
Space Requirement	❌ Large, bulky footprint	✅ Extremely Compact, Low-Profile
Potential Leak Paths	⚠️ 2 Threaded Connections	✅ 2 Threaded Connections (but more robust)
Installation Time	❌ High (Requires 2 components)	✅ Low (Single component installation)
Structural Strength	⚠️ Lower (multiple components)	✅ Superior (Monolithic Forged Body)
Pressure Rating	❌Cast, often limited to 150 - 3,000 PSI	✅ Up to 20,000 PSI for critical high-pressure service

📌 Targeted Application Support

Instrument Installation: Allows a smaller pressure gauge or sensor with a male thread to be installed into a larger, existing port on a vessel or pipe.

Manifold Customization: Adapt ports on a manifold to accommodate different-sized valves or outlets.

System Retrofitting & MRO: The perfect problem-solver for connecting new components to older equipment with different thread sizes.

Pump & Compressor Skids: Provides a compact way to step down thread sizes for auxiliary lines and instrumentation.

❓ Frequently Asked Questions (FAQ)

Q1: What is the main purpose of a hex bushing?

Its main purpose is to reduce the size of a female threaded port. It allows you to securely connect a smaller male-threaded pipe or fitting into a larger female port, providing a compact and reliable transition.

Q2: Do I need to use thread sealant on both the male and female threads?

You only need to apply thread sealant to the male threads. This includes the male thread of the bushing itself, and the male thread of the pipe or fitting you are installing into the bushing.

Q3: Why is it called a "hex" bushing?

It is named for the external hexagonal head that provides a secure, non-slip grip for wrenches. This design allows for high-torque installation in tight spaces, ensuring a leak-free seal between mismatched port sizes.

Q4: What is the difference between a hex bushing and a bell reducer?

A Hex Bushing is a male-to-female reducer that fits almost entirely inside the larger port, making it very compact. A Bell Reducer is a female-to-female reducer that sits entirely outside the ports and requires two additional male-threaded fittings (nipples) to connect to. For most applications, the hex bushing is a more space-saving and robust solution.

📦 Complete Size Chart

Need a custom material or thread type?[Request Custom Configuration]

💬 Still Have Questions?

Our engineering team is ready to assist with technical selection, system design, or material recommendations.

[Chat with an Engineer] [Email: sales@starkvalve.com] [Call: +86-13917221881]

🔒 Disclaimer

Swagelok® and Parker® are registered trademarks of their respective holders. Stark is not affiliated with, endorsed by, or sponsored by these companies. Part numbers and brand names are provided for cross-reference and compatibility purposes only.