Service Metal
Stainless Steel 150# NPT Union
- SKU:
- SSPU
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
Stainless Steel 150# NPT Union
Stainless Steel 150# NPT Unions provide a threaded connection that allows two sections of piping to be joined while also permitting convenient disassembly when maintenance, equipment service, or piping changes are required. Available in both 304 and 316 stainless steel, these unions feature female NPT connections and an SP114 pattern.
Product Highlights
- Threaded stainless steel pipe union
- Available in 304 or 316 stainless steel
- 150 lb pressure class
- Female NPT threaded connections
- SP114 pattern
- Allows piping sections to be disconnected without cutting pipe
- Useful for serviceable equipment and piping connections
- Corrosion-resistant stainless steel construction
- Sizes available from 1/8" through 4"
- Manufactured by Service Metal
Technical Specifications
| Manufacturer | Service Metal |
|---|---|
| Product Type | Threaded Union |
| Material Options | 304 Stainless Steel or 316 Stainless Steel |
| Pressure Class | 150 lb |
| Connection Type | Female NPT Threaded |
| Pattern | SP114 Pattern |
| 304 SS Size Range | 1/8" through 4" |
| 316 SS Size Range | 1/8" through 3" in this listing |
| 304 SS Series | SSP4U |
| 316 SS Series | SSP6U |
Choose 304 or 316 Stainless Steel
304 Stainless Steel
The SSP4U series is manufactured from 304 stainless steel and provides corrosion resistance and durability for industrial, commercial, mechanical, and general threaded piping applications where 304 stainless steel is compatible with the service conditions.
316 Stainless Steel
The SSP6U series provides the same union configuration in 316 stainless steel. Select 316 stainless steel when that material grade is specified or required by the piping system or application.
Why Use a Pipe Union?
Serviceable Connection
- Allows connected piping sections to be separated
- Useful near valves, pumps, filters, and equipment
- Simplifies maintenance and equipment replacement
- Reduces the need to cut threaded piping for service
- Provides a reusable mechanical connection when properly installed
Female NPT Connections
- Female NPT threaded connections
- Connects compatible male NPT pipe and fittings
- No welding required for threaded assembly
- Available across a broad nominal pipe-size range
- Suitable for new installations and maintenance work
Available Sizes & Materials
304 Stainless Steel — SSP4U Series
- 1/8"
- 1/4"
- 3/8"
- 1/2"
- 3/4"
- 1"
- 1-1/4"
- 1-1/2"
- 2"
- 2-1/2"
- 3"
- 4"
316 Stainless Steel — SSP6U Series
- 1/8"
- 1/4"
- 3/8"
- 1/2"
- 3/4"
- 1"
- 1-1/4"
- 1-1/2"
- 2"
- 2-1/2"
- 3"
Performance Features
150 lb Class
These unions are identified as 150 lb class stainless steel threaded fittings.
NPT Threaded
Female NPT connections allow the union to connect with compatible male threaded pipe, nipples, fittings, valves, and equipment connections.
Removable Joint
The union configuration provides a connection that can be separated for maintenance or equipment access without cutting the adjoining threaded pipe.
Common Applications
Industrial & Process Piping
- Industrial piping systems
- Process piping
- Utility piping
- Pump connections
- Valve connections
- Equipment service points
Commercial & Mechanical Piping
- Commercial mechanical systems
- Stainless steel piping assemblies
- Equipment rooms
- Filter and regulator connections
- Maintenance-access connections
- General threaded piping
Selecting the Correct Union
Select the union according to the nominal pipe size and stainless steel grade required by the system. SSP4U-series unions are 304 stainless steel, while SSP6U-series unions are 316 stainless steel.
These fittings use female NPT threaded connections. Confirm the mating thread size, required stainless steel grade, and union configuration before ordering.
Ask Willy: Need Pipe Size Help?
Use our common pipe diameters and wall thickness chart to confirm sizing before ordering 150# stainless steel threaded unions. 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 union.
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 the required nominal pipe size before ordering.
- Select either 304 or 316 stainless steel according to the piping specification.
- Verify that a threaded union is appropriate for the piping layout.
- Verify that female NPT threaded connections are required.
- Confirm stainless steel compatibility with the intended service.
- Use thread sealant suitable for the piping material and conveyed media.
- Avoid cross-threading during assembly.
- Use appropriate practices to minimize stainless steel thread galling.
- Do not over-tighten threaded stainless steel fittings.
- Assemble the union so the joint can be accessed for future service.
- 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 pipe size, stainless steel grade, connection requirements, and application before you order.
Frequently Asked Questions
What is a pipe union used for?
A union joins two sections of threaded piping while allowing the connection to be separated later for maintenance, equipment replacement, or system changes.
Are these unions available in both 304 and 316 stainless steel?
Yes. This listing includes both SSP4U 304 stainless steel and SSP6U 316 stainless steel unions.
What is the difference between SSP4U and SSP6U?
The SSP4U series is manufactured from 304 stainless steel, while the SSP6U series is manufactured from 316 stainless steel.
What connection type does the union use?
These unions use female NPT threaded connections.
Why would I use a union instead of a coupling?
A coupling creates an inline connection but generally requires the piping to be rotated or otherwise disassembled for removal. A union is specifically designed so the connected piping sections can be separated at the union joint for service.
What pressure class are these fittings?
These stainless steel threaded unions are identified as 150 lb class fittings.
What sizes are available?
The 304 stainless steel SSP4U series in this listing ranges from 1/8" through 4". The supplied 316 stainless steel SSP6U series ranges from 1/8" through 3".
Is a 4" 316 stainless steel union included?
No. A 4" SSP6U SKU was not included in the supplied product set, so this listing does not include a 4" 316 stainless steel variant.
How do I select the correct variant?
Select the nominal pipe size required by the piping system and then select either 304 or 316 stainless steel according to the material requirements of the application.
Important Ordering Notes
- This listing is for stainless steel NPT unions.
- SSP4U-series SKUs are 304 stainless steel.
- SSP6U-series SKUs are 316 stainless steel.
- Fittings are 150 lb class.
- Connections are female NPT threaded.
- Product is identified as an SP114 pattern fitting.
- 304 stainless steel variants are available from 1/8" through 4".
- The supplied 316 stainless steel variants are available from 1/8" through 3".
- No 4" 316 stainless steel variant is included in this listing.
- Select the correct nominal pipe size 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.
