Service Metal
300# Black Malleable Reducing Couplings
- SKU:
- XBR
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
300# Black Malleable Iron Reducing Coupling
300# Black Malleable Iron Reducing Couplings are designed to connect two male-threaded pipes of different nominal sizes in a straight run within higher-duty threaded piping systems.
Manufactured from durable malleable iron, these Class 300 reducing couplings provide a compact, secure pipe-size transition for industrial, commercial, mechanical, gas, oil, air, and general fluid piping applications where dependable threaded connections are required.
Product Highlights
- Reducing coupling configuration
- Female NPT x female NPT connections
- Connects two different nominal pipe sizes
- Maintains a straight in-line piping transition
- Compact design can reduce the need for additional fittings
- Designed for higher-duty Class 300 threaded piping systems
- Durable black malleable iron construction
- Malleable castings conform to ASTM A197
- Malleable fitting dimensions conform to ASME B16.3
- NPT threads conform to ASME B1.20.1
- Class 300 fittings are UL Listed
- Suitable for gas, oil, air, and compatible fluid applications
- Manufactured in an ISO-certified facility
- Country of origin: Thailand & China
Technical Specifications
| Product Type | Reducing Coupling |
|---|---|
| Material | Malleable Iron |
| Finish | Black |
| Pressure Class | 300# |
| Connection Type | Female NPT x Female NPT |
| Configuration | Straight Reducing Coupling |
| Primary Function | Connect Different Male-Threaded Pipe Sizes |
| Casting Standard | ASTM A197 |
| Dimensional Standard | ASME B16.3 |
| Thread Standard | ASME B1.20.1 |
| Listing | Class 300 Fittings are UL Listed |
| Manufacturing | ISO-Certified Facility |
| Country of Origin | Thailand & China |
Construction & Applications
Malleable Iron Construction
Manufactured from malleable iron castings conforming to ASTM A197 for dependable strength and durability in demanding threaded piping systems.
In-Line Size Reduction
Two different female NPT connection sizes allow the fitting to transition between different nominal pipe diameters without changing the direction of the piping run.
Compact Threaded Design
The reducing configuration can eliminate the need for a separate equal-size coupling and reducing bushing, helping simplify compact piping layouts.
Why Use a Reducing Coupling?
Direct Pipe Size Transition
A reducing coupling provides a direct transition between two different nominal pipe sizes while keeping the piping run straight.
Female-to-Female Connection
Both ends are internally threaded, allowing male-threaded pipes of different sizes to connect directly through the fitting.
Typical Applications
Industrial & Mechanical Piping
- Industrial piping systems
- Mechanical piping
- Commercial piping systems
- General utility piping
- Pipe-size transition points
Common Service Applications
- Gas piping
- Oil piping
- Compressed air systems
- Compatible fluid piping
- General threaded piping
Ask Willy: Need Pipe Size Help?
Use our common pipe diameters and wall thickness chart to confirm both connection sizes before ordering 300# black malleable iron reducing couplings. You can also review the specification sheet and Certificate of Conformance below.
Standards & Approvals
ASTM A197
Malleable iron castings conform to ASTM A197.
ASME Standards
Malleable fitting dimensions conform to ASME B16.3, while NPT threads conform to ASME B1.20.1.
UL Listing
The supplied product information states that Class 300 fittings are UL Listed.
Related Malleable Iron Standards
- Malleable bushings, plugs, and locknuts conform to ASME B16.14.
- Malleable unions conform to ASME B16.39.
- NPT threads on applicable fittings conform to ASME B1.20.1.
- Malleable fitting dimensions conform to ASME B16.3.
Need More 300# Black Malleable Iron Fittings?
Browse our complete selection of 300# black malleable iron fittings, including reducing couplings, standard couplings, tees, elbows, unions, bushings, and other heavy-duty threaded fittings.
Frequently Asked Questions
What is a 300# black malleable iron reducing coupling used for?
It is used to connect two compatible male-threaded pipes of different nominal sizes in a straight run within a higher-duty threaded piping system.
What type of connections does this fitting use?
The reducing coupling uses female NPT threaded connections on both ends.
How is a reducing coupling different from a standard coupling?
A standard coupling connects two pipes of the same nominal size. A reducing coupling has different connection sizes so it can transition between two pipe diameters.
How is a reducing coupling different from a hex bushing?
A reducing coupling has female threads on both ends. A conventional hex bushing typically has male threads on the outside and female threads on the inside.
Does this fitting change pipe direction?
No. A reducing coupling maintains a straight piping run while changing nominal pipe size.
Why use a reducing coupling instead of multiple fittings?
A reducing coupling combines the straight connection and size transition into one fitting, which can simplify installation and reduce the number of threaded joints.
How is a 300# reducing coupling different from a 150# version?
The Class 300 fitting is a heavier-duty fitting intended for more demanding threaded piping applications than a standard Class 150 fitting.
What material standard applies?
The supplied product information states that the malleable iron castings conform to ASTM A197.
What thread standard applies?
NPT threads conform to ASME B1.20.1.
Are Class 300 fittings UL Listed?
Yes. The supplied product information states that Class 300 fittings are UL Listed.
Important Ordering & Installation Notes
- Confirm both nominal connection sizes before ordering.
- Both ends use female NPT threads.
- This fitting changes pipe size without changing pipe direction.
- Do not confuse a reducing coupling with an equal-size coupling or a male x female hex bushing.
- Confirm that Class 300 construction is appropriate for the intended piping system.
- NPT threads conform to ASME B1.20.1.
- Malleable fitting dimensions conform to ASME B16.3.
- Use compatible threaded pipe, fittings, and thread sealant appropriate for the intended system.
- Do not assume the “300#” class designation alone establishes allowable working pressure for every service condition.
- Verify pressure, temperature, media compatibility, applicable codes, and approval requirements before installation.
- Refer to the specification sheet and Certificate of Conformance for additional product information.
