Service Metal
3000# Forged Steel Threaded Caps
- SKU:
- 3MCAPT
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
3000# Forged Steel Threaded Cap
3000# Forged Steel Threaded Caps are designed to securely close the end of compatible male-threaded pipe in high-pressure piping systems.
Manufactured from normalized forged carbon steel conforming to ASME SA105N, these caps feature female NPT threads conforming to ASME B1.20.1 for a compact and dependable threaded closure. Forged steel fitting dimensions conform to ASME B16.11, making these fittings suitable for industrial, commercial, oil and gas, power generation, mechanical, and process piping applications.
Product Highlights
- 3000# forged steel threaded cap
- Designed to close the end of male-threaded pipe
- Female NPT threaded connection
- Compact forged steel closure fitting
- Forged steel fitting material conforms to ASME SA105N
- Material is normalized
- Forged steel fitting dimensions conform to ASME B16.11
- NPT threads conform to ASME B1.20.1
- Forged steel socket weld inserts conform to MSS-SP-79
- Forged steel unions conform to MSS-SP-83
- Forged steel outlet fittings conform to MSS-SP-97
- Manufacturing facility is ISO certified
- Product specification sheet available
- Certificate of Conformance available
Technical Specifications
| Product Type | Threaded Cap |
|---|---|
| Pressure Class | 3000# |
| Material | Forged Carbon Steel |
| Connection Type | Female NPT |
| Configuration | Threaded Pipe-End Closure |
| Primary Function | Close the End of Male-Threaded Pipe |
| Material Standard | ASME SA105N |
| Heat Treatment | Normalized |
| Dimensional Standard | ASME B16.11 |
| Thread Standard | ASME B1.20.1 |
| Socket Weld Insert Standard | MSS-SP-79 |
| Forged Steel Union Standard | MSS-SP-83 |
| Outlet Fitting Standard | MSS-SP-97 |
| Manufacturing | ISO-Certified Facility |
| Documentation | Specification Sheet and Certificate of Conformance Available |
Threaded Cap Configuration
Female NPT Opening
The internal female NPT threads install over a compatible male-threaded pipe end.
Forged Cap Body
The forged steel body provides a compact closure fitting for the end of a threaded piping run.
Closed End
The opposite end is closed to terminate the pipe run while maintaining a removable threaded connection.
Construction Details
These 3000# threaded caps are manufactured from normalized ASME SA105N forged carbon steel. Forged steel fitting dimensions conform to ASME B16.11.
Precision-machined female NPT threads conform to ASME B1.20.1, allowing the cap to install over a compatible male-threaded pipe end to provide a removable piping closure.
Why Choose a Forged Steel Threaded Cap?
Removable Pipe-End Closure
- Closes the end of male-threaded pipe
- Female NPT threaded connection
- Can be removed for future maintenance or system access
- Compact forged fitting configuration
- Designed for compatible 3000# threaded systems
Forged Steel Construction
- Manufactured from forged carbon steel
- Material conforms to ASME SA105N
- Normalized material condition
- Dimensions conform to ASME B16.11
- Manufactured in an ISO-certified facility
Threaded Cap vs. Threaded Plug
Threaded Cap
A threaded cap has internal female threads and installs over a compatible male-threaded pipe end.
Threaded Plug
A threaded plug has external male threads and installs into a compatible female-threaded fitting or opening.
Typical Applications
Industrial & Mechanical Piping
- Industrial process piping
- Mechanical piping systems
- Plant utility piping
- Power generation systems
- Fabricated piping assemblies
Pipe-End Closures
- Oil and gas piping
- Temporary line closures
- Future expansion points
- Equipment piping
- Compatible high-pressure threaded systems
Applicable Forged Steel Standards
ASME SA105N
Forged steel fitting material conforms to ASME SA105N and is supplied in the normalized condition.
ASME B16.11 & B1.20.1
Forged steel fitting dimensions conform to ASME B16.11, while NPT threads conform to ASME B1.20.1.
Related MSS Standards
Forged steel socket weld inserts conform to MSS-SP-79, unions conform to MSS-SP-83, and outlet fittings conform to MSS-SP-97.

Ask Willy: Need Pipe Size Help?
Use our common pipe diameters and wall thickness chart to confirm sizing before ordering 3000# forged steel threaded caps. 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 3000# forged steel threaded cap.
Pipe Size Chart
Use the common pipe diameters and wall thickness chart to help confirm compatible threaded pipe sizing before ordering.
Certificate of Conformance
Certificate of Conformance documentation is available through the linked PDF.
Frequently Asked Questions
What is a 3000# forged steel threaded cap?
It is a forged steel closure fitting with female NPT threads designed to install over a compatible male-threaded pipe end.
What type of connection does this cap use?
The fitting uses a female NPT threaded connection.
How is a threaded cap different from a threaded plug?
A cap has internal female threads and fits over a male-threaded pipe end, while a plug has external male threads and installs into a female-threaded opening.
Can the cap be removed later?
Yes. Because it uses a threaded connection, the cap can be removed when future access, maintenance, or system modification is required.
What material standard applies?
The supplied product information states that forged steel fitting material conforms to ASME SA105N.
Is the material normalized?
Yes. The supplied product information specifies normalized forged carbon steel.
What dimensional standard applies?
Forged steel fitting dimensions conform to ASME B16.11.
What standard applies to the NPT threads?
NPT threads conform to ASME B1.20.1.
Is the manufacturing facility ISO certified?
Yes. The supplied product information states that the manufacturing facility is ISO certified.
What should I verify before ordering?
Confirm the nominal pipe size, 3000# class, female NPT connection, material requirements, and applicable piping-system specifications before ordering.
Important Ordering & Installation Notes
- Confirm the required nominal NPT size before ordering.
- This listing is for a 3000# forged steel threaded cap.
- Confirm that a female-threaded cap matches the intended male-threaded pipe end.
- Forged steel fitting material conforms to ASME SA105N and is normalized.
- Forged steel fitting dimensions conform to ASME B16.11.
- NPT threads conform to ASME B1.20.1.
- Verify compatibility with the adjoining male-threaded pipe.
- Use appropriate thread sealant or PTFE tape where permitted by the applicable piping code, project specification, and service.
- Avoid excessive tightening that could damage threads or adjoining components.
- Confirm applicable pressure, temperature, material, and project requirements before installation.
- Review the product specification sheet before installation.
- Certificate of Conformance documentation is available from the link above.