Description

Description

Stainless Steel 150# NPT Round Cap

Stainless Steel 150# NPT Round Caps provide a threaded closure for terminating the end of a compatible male NPT pipe or fitting. Available in both 304 and 316 stainless steel, these caps feature female NPT threads and an SP114 pattern for stainless steel threaded piping systems.

Available in nominal pipe sizes from 1/8" through 4", this product family provides both 304 and 316 stainless steel options across the complete size range. Select the required nominal pipe size and stainless steel grade for your application.

Product Highlights

Female threaded round pipe cap
Available in 304 or 316 stainless steel
150 lb pressure class
Female NPT threaded connection
SP114 pattern
Designed to close the end of a compatible male NPT connection
Corrosion-resistant stainless steel construction
Available in nominal sizes from 1/8" through 4"
All listed sizes available in both 304 and 316 stainless steel
Manufactured by Service Metal

Technical Specifications

Manufacturer	Service Metal
Product Type	Round Cap
Material Options	304 Stainless Steel or 316 Stainless Steel
Pressure Class	150 lb
Connection Type	Female NPT Threaded
Pattern	SP114 Pattern
Available Sizes	1/8", 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3" and 4"
304 SS Series	SSP4CP
316 SS Series	SSP6CP

Choose 304 or 316 Stainless Steel

304 Stainless Steel

The SSP4CP series is manufactured from 304 stainless steel. It provides corrosion resistance and durability for a broad range of industrial, commercial, mechanical, and general threaded piping applications where 304 stainless steel is compatible with the service conditions.

316 Stainless Steel

The SSP6CP series provides the same threaded cap configuration in 316 stainless steel. Select the 316 stainless steel option when that material grade is specified or required for the piping application.

Threaded Pipe Closure

Female NPT Connection

Female NPT threaded connection
Threads onto compatible male NPT pipe or fittings
Designed to terminate a threaded piping run
No welding required for threaded installation
Available across a broad range of nominal pipe sizes

Removable Closure

Provides a threaded end closure
Useful where future access may be required
Can be removed from compatible threaded piping
Suitable for equipment and piping assemblies
Provides a compact termination point

Available Sizes & Materials

Every nominal pipe size in this listing is available in both 304 stainless steel and 316 stainless steel:

1/8" — 304 SS or 316 SS
1/4" — 304 SS or 316 SS
3/8" — 304 SS or 316 SS
1/2" — 304 SS or 316 SS
3/4" — 304 SS or 316 SS
1" — 304 SS or 316 SS
1-1/4" — 304 SS or 316 SS
1-1/2" — 304 SS or 316 SS
2" — 304 SS or 316 SS
2-1/2" — 304 SS or 316 SS
3" — 304 SS or 316 SS
4" — 304 SS or 316 SS

Performance Features

150 lb Class

These round caps are identified as 150 lb class stainless steel threaded fittings.

NPT Threaded

The female NPT connection allows the cap to thread onto a compatible male NPT pipe, nipple, fitting, or equipment connection.

Two Stainless Grades

Select either 304 or 316 stainless steel according to the piping specification and application requirements.

Common Applications

Industrial & Process Piping

Industrial piping systems
Process piping
Utility piping
Equipment connections
Maintenance and repair installations
Threaded piping terminations

Commercial & Mechanical Piping

Commercial mechanical systems
Stainless steel piping assemblies
Equipment rooms
General threaded piping
Pipe-end closures
Applications requiring stainless steel fittings

Selecting the Correct Cap

Select the cap according to both the nominal pipe size and stainless steel grade required by the system. The SSP4CP series is 304 stainless steel, while the SSP6CP series is 316 stainless steel.

The cap has a female NPT threaded connection and is intended to thread onto a corresponding male NPT connection. Confirm the pipe size, connection type, and required stainless steel grade 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 caps. You can also review the product specification sheet and Certificate of Conformance below.

View Pipe Size Chart PDF Spec Sheet PDF Certificate of Conformance PDF

Product Documentation

Product Specification Sheet

Review the specification sheet for dimensional and product-specific information on the 150# stainless steel threaded cap.

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.
Confirm that a female NPT threaded cap is required.
Verify 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.
Do not over-tighten threaded stainless steel fittings.
Confirm pressure and temperature requirements for the complete piping system.
Inspect the completed connection for leakage before placing the system into service.
Follow applicable piping codes, specifications, and project requirements.

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.

Email the GetPipe.com Team Visit Quick Support

Frequently Asked Questions

What is this stainless steel cap used for?

This cap is used to close or terminate the end of a compatible male NPT threaded pipe, nipple, fitting, or equipment connection.

Is this available in both 304 and 316 stainless steel?

Yes. Every nominal size in this listing is available in both 304 and 316 stainless steel.

What is the difference between the SSP4CP and SSP6CP series?

The SSP4CP series is manufactured from 304 stainless steel, while the SSP6CP series is manufactured from 316 stainless steel.

What connection does the cap use?

The cap uses a female NPT threaded connection.

What sizes are available?

Available nominal sizes are 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", and 4".

What pressure class are these caps?

These stainless steel threaded caps are identified as 150 lb class fittings.

What does SP114 pattern mean on this product?

The product information identifies these stainless steel threaded caps as SP114 pattern fittings.

How do I select the correct cap?

Select the nominal size that matches the male NPT connection being capped, then select either 304 or 316 stainless steel according to the piping specification.

Can I use a threaded cap where future piping access is required?

A threaded cap provides a removable closure when installed on a compatible threaded connection. Follow the piping-system requirements and appropriate installation practices when removing or reinstalling the cap.

Important Ordering Notes

This listing includes both 304 and 316 stainless steel round caps.
SSP4CP-series SKUs are 304 stainless steel.
SSP6CP-series SKUs are 316 stainless steel.
Fittings are 150 lb class.
Connections are female NPT threaded.
Product is identified as an SP114 pattern fitting.
Available nominal sizes range from 1/8" through 4".
All listed nominal sizes are available in both stainless steel grades.
Select both 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.