Service Metal
Stainless Steel 150# NPT Reducing Coupling
- SKU:
- SSPR
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
Stainless Steel 150# NPT Reducing Coupling
Stainless Steel 150# NPT Reducing Couplings provide an inline threaded transition between two different nominal pipe sizes. Available in both 304 and 316 stainless steel, these reducing couplings feature female NPT connections at both ends and an SP114 pattern for stainless steel threaded piping systems.
The SSP4R series is manufactured from 304 stainless steel, while the SSP6R series is manufactured from 316 stainless steel. A broad selection of reducing combinations is available, ranging from 1/4" x 1/8" through 4" x 3", depending on the selected stainless steel grade.
Product Highlights
- Threaded reducing pipe coupling
- Available in 304 or 316 stainless steel
- 150 lb pressure class
- Female NPT x female NPT connections
- SP114 pattern
- Connects two different nominal pipe sizes in line
- Corrosion-resistant stainless steel construction
- Broad selection of reducing size combinations
- No welding required for threaded installation
- Manufactured by Service Metal
Technical Specifications
| Manufacturer | Service Metal |
|---|---|
| Product Type | Reducing Coupling |
| Material Options | 304 Stainless Steel or 316 Stainless Steel |
| Pressure Class | 150 lb |
| Connection Type | Female NPT x Female NPT |
| Pattern | SP114 Pattern |
| Largest Listed Connection | 4" |
| Smallest Listed Connection | 1/8" |
| 304 SS Series | SSP4R |
| 316 SS Series | SSP6R |
Choose 304 or 316 Stainless Steel
304 Stainless Steel
The SSP4R series is manufactured from 304 stainless steel and provides corrosion resistance and durability for industrial, commercial, mechanical, and general threaded piping systems where 304 stainless steel meets the service requirements.
316 Stainless Steel
The SSP6R series provides the same reducing-coupling configuration in 316 stainless steel. Select the 316 stainless steel option when that material grade is specified or required for the piping application.
Reducing Coupling Configuration
Female NPT x Female NPT
- Female NPT connection at both ends
- Joins two compatible male NPT components
- Provides an inline transition between different sizes
- Suitable for threaded pipe, nipples, and fittings
- No welding required for threaded assembly
Inline Size Reduction
- Transitions from a larger nominal pipe size to a smaller size
- Provides a compact straight-line reduction
- Can reduce the number of individual fittings required
- Useful for equipment and piping transitions
- Available in numerous size combinations
Understanding Reducing Coupling Sizes
Reducing coupling sizes are shown as larger connection x smaller connection. For example, a 2" x 1" reducing coupling provides female NPT connections for transitioning between compatible 2" and 1" male threaded components.
Size availability varies between 304 and 316 stainless steel. Select only from the exact size and material combinations available in the product options.
Performance Features
150 lb Class
These reducing couplings are identified as 150 lb class stainless steel threaded fittings.
NPT Threaded
Female NPT connections provide compatibility with corresponding male threaded pipe, nipples, fittings, valves, and equipment connections.
Multiple Reductions
A broad selection of reducing combinations provides options for transitioning between commonly used threaded pipe sizes.
Common Applications
Industrial & Process Piping
- Industrial piping systems
- Process piping
- Utility piping
- Equipment connections
- Valve and instrument piping
- Maintenance and repair installations
Commercial & Mechanical Piping
- Commercial mechanical systems
- Stainless steel piping assemblies
- Equipment rooms
- Threaded size transitions
- General-purpose threaded piping
- Applications requiring stainless steel fittings
Selecting the Correct Reducing Coupling
Confirm the larger connection size, smaller connection size, and stainless steel grade required by the piping system. SSP4R-series reducing couplings are 304 stainless steel, while SSP6R-series reducing couplings are 316 stainless steel.
Both ends are female NPT threaded. Verify that the mating components have compatible male NPT connections and select the exact reducing combination shown in the product options.
Ask Willy: Need Pipe Size Help?
Use our common pipe diameters and wall thickness chart to confirm sizing before ordering 150# stainless steel threaded reducing couplings. You can also review the product specification sheet and Certificate of Conformance below.
Product Documentation
Product Specification Sheet
Review the specification sheet for dimensional and product-specific information on the 150# stainless steel threaded reducing coupling.
Pipe Size Chart
Use the common pipe diameters and wall thickness chart to help confirm compatible pipe sizing before ordering.
Certificate of Conformance
Certificate of Conformance documentation is available through the linked PDF.
Installation & Selection Guidance
- Confirm both nominal connection sizes before ordering.
- Select either 304 or 316 stainless steel according to the piping specification.
- Verify that a female NPT x female NPT reducing coupling is required.
- Confirm stainless steel compatibility with the intended service.
- Use thread sealant suitable for the piping material and conveyed media.
- Avoid cross-threading during installation.
- Use appropriate installation practices for stainless steel threaded components.
- Use appropriate practices to minimize stainless steel thread galling.
- Do not over-tighten threaded stainless steel fittings.
- Confirm pressure and temperature requirements for the complete piping system.
- Inspect completed connections for leakage before placing the system into service.
- Follow applicable piping codes and project specifications.
Need Help Selecting Stainless Steel Fittings?
Our industrial PVF specialists can help review your connection sizes, stainless steel grade, piping requirements, and application before you order.
Frequently Asked Questions
What is a reducing coupling used for?
A reducing coupling provides a straight inline transition between two different nominal pipe sizes while connecting compatible male NPT components.
Are these available in both 304 and 316 stainless steel?
Yes. This listing contains both SSP4R 304 stainless steel and SSP6R 316 stainless steel reducing couplings.
What is the difference between SSP4R and SSP6R?
The SSP4R series is manufactured from 304 stainless steel, while the SSP6R series is manufactured from 316 stainless steel.
What connection type do these couplings use?
These reducing couplings have female NPT threaded connections at both ends.
How are reducing coupling sizes listed?
Sizes are shown as the larger nominal connection followed by the smaller nominal connection. For example, 2" x 1" indicates a reduction between 2" and 1" NPT connections.
What pressure class are these fittings?
These stainless steel threaded reducing couplings are identified as 150 lb class fittings.
Are all reducing combinations available in both stainless steel grades?
No. Available combinations differ between 304 and 316 stainless steel. Select only from the exact variants displayed in this listing.
Is a reducing coupling the same as a hex bushing?
No. A reducing coupling has female NPT connections at both ends. A hex bushing uses a male NPT connection on the larger end and a female NPT connection on the smaller end.
How do I select the correct variant?
Confirm the larger connection size, smaller connection size, and required 304 or 316 stainless steel grade before ordering.
Important Ordering Notes
- This listing is for stainless steel NPT reducing couplings.
- SSP4R-series SKUs are 304 stainless steel.
- SSP6R-series SKUs are 316 stainless steel.
- Fittings are 150 lb class.
- Connections are female NPT x female NPT.
- Product is identified as an SP114 pattern fitting.
- Sizes are listed as larger connection x smaller connection.
- 304 and 316 stainless steel size availability differs for certain reductions.
- Select the exact connection sizes and stainless steel grade before ordering.
- Verify material compatibility with the intended application.
- Confirm system pressure, temperature, and material requirements before installation.
- Product dimensions and weight vary by selected size and material.
