Charman Inc.
304 Stainless Steel 150# Square Head Solid Plug - SP112
- Availability:
- Usually in Stock – Ships Quickly
- Weight:
- 0.00 LBS
Description
304 Stainless Steel 150# Square Head Solid Plug - SP112
Charman Inc 304 Stainless Steel 150# Square Head Solid Plugs - SP112 provide a durable, corrosion-resistant way to close female-threaded pipe, fitting, valve, manifold, and equipment connections. Available in nominal pipe sizes from 1/8" through 3", these solid plugs combine a male NPT connection with a square head for positive wrench engagement during installation and removal.
The solid-body design permanently closes the internal passage through the fitting while retaining a removable threaded connection. The square head provides accessible wrench flats, making the SP112 plug well suited for industrial, mechanical, utility, maintenance, process-piping, and equipment applications.
Product Highlights
- Charman Inc SP112 square head solid plug
- 304 stainless steel construction
- 150# threaded fitting
- Male NPT connection
- Solid plug configuration closes a female-threaded opening
- Square head provides wrench engagement for installation and removal
- Corrosion-resistant stainless steel construction
- Available in nominal pipe sizes from 1/8" through 3"
- Removable threaded connection does not require welding
- Suitable for industrial, commercial, mechanical, utility, and process-piping systems
Technical Specifications
| Product Type | Square Head Solid Plug |
|---|---|
| Brand | Charman Inc |
| Series / Pattern | SP112 |
| Material | 304 Stainless Steel |
| Pressure Class | 150# |
| Connection | Male NPT |
| Head Style | Square Head |
| Plug Style | Solid |
| Available Sizes | 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2" and 3" |
| Casting Standard | ASTM A351 |
| Dimensional Standard | MSS SP-114, except wall and bands |
| Thread Standard | ASME B1.20.1 NPT |
| Primary Function | Closing and terminating compatible female NPT connections |
What Is an SP112 Square Head Solid Plug?
The Charman Inc SP112 square head solid plug is a male-threaded stainless steel fitting used to close a compatible female NPT opening. The solid plug body blocks flow through the connection while the external NPT threads allow the plug to be installed or removed as needed.
The square-shaped head provides flat wrenching surfaces for installation and removal. This makes the fitting useful for piping termination points, unused equipment ports, manifolds, valves, inspection connections, and other female-threaded openings that need to be securely closed.
Why Choose a 304 Stainless Steel Square Head Plug?
304 Stainless Steel Construction
- Provides good general corrosion resistance
- Suitable for many industrial and commercial environments
- Durable construction for threaded piping systems
- Useful where stainless steel components are specified
- Well suited for process, utility, mechanical, and equipment applications
Square Head Design
- Provides accessible wrenching surfaces
- Supports controlled installation and removal
- Useful where future access may be required
- Compact plug configuration
- Male NPT connection installs directly into compatible female threads
Common Applications
Industrial & Process Piping
- Process piping systems
- Industrial utility piping
- Unused branch connections
- Maintenance and inspection ports
- Threaded stainless steel assemblies
Equipment & Mechanical Systems
- Valve ports
- Manifold connections
- Equipment openings
- Mechanical piping systems
- Temporary or permanent threaded closures
Plug vs. Cap
A threaded plug has male threads and installs into a female-threaded opening. A threaded cap has female threads and installs over a male-threaded pipe, nipple, or fitting.
The SP112 fittings in this listing are male NPT square head solid plugs intended for compatible female NPT connections.
Square Head vs. Other Plug Styles
The square head provides external wrench flats that remain accessible after the plug is installed. This can make installation and later removal straightforward where sufficient clearance is available around the fitting.
Plug style should be selected based on piping layout, available tool clearance, connection requirements, and whether future removal or access is anticipated.
Where an SP112 Square Head Plug Makes Sense
- Closing unused female NPT pipe fittings
- Terminating valve or manifold ports
- Closing equipment connections
- Creating removable inspection or maintenance closures
- Sealing unused branches in threaded piping systems
- Temporary closure during fabrication or maintenance
- Applications where external wrench access is preferred
Ask Willy: Need Stainless Steel Fitting Information?
Review the Charman Inc stainless steel fittings specification sheet for product, material, thread, and dimensional information on SP112 threaded fittings, or use the complete stainless steel fittings catalog to compare available fitting styles, configurations, and sizes before ordering.
Installation & Selection Guidance
- Confirm the required nominal pipe size before ordering.
- Verify that the mating opening has a compatible female NPT connection.
- Confirm that a solid plug is appropriate for the intended closure.
- Confirm that 304 stainless steel is compatible with the intended service.
- Inspect the plug and mating threads for damage or contamination before installation.
- Use a thread-sealing method appropriate for the system media, pressure, temperature, and application.
- Begin threading by hand whenever possible to reduce the risk of cross-threading.
- Use an appropriately sized wrench on the square head during tightening.
- Avoid excessive tightening that could damage the plug or mating female threads.
- Ensure adequate clearance around the square head for installation and future removal.
- Confirm pressure and temperature requirements for the complete piping system.
- Pressure-test completed assemblies where required by the application.
- Installation should be completed by qualified personnel and in accordance with applicable codes and specifications.
Product Selection Considerations
Nominal Pipe Size
Select the SP112 square head plug based on the nominal pipe size of the female NPT opening being closed. Available sizes in this listing range from 1/8" through 3".
Tool Clearance
Allow sufficient clearance around the fitting for a wrench to engage the square head. This is especially important where the plug is installed near adjacent pipe, valves, equipment, or structural components.
Need Help Selecting a Stainless Steel Pipe Fitting?
Our industrial PVF specialists can help review your pipe size, connection type, stainless steel requirements, application, and installation conditions before you order.
Frequently Asked Questions
What is the Charman Inc SP112 square head solid plug?
It is a 304 stainless steel 150# male NPT fitting used to close a compatible female-threaded piping or equipment connection.
What type of connection does the plug have?
The SP112 plug has a male NPT threaded connection.
What material are these plugs made from?
The plugs in this listing are manufactured from 304 stainless steel.
What does solid plug mean?
A solid plug closes the opening rather than providing a passage through the fitting.
Why does the plug have a square head?
The square head provides external flat surfaces for wrench engagement during installation and removal.
What sizes are available?
This listing includes 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", and 3" nominal pipe sizes.
What is the difference between a plug and a cap?
A plug has male threads and installs into a female-threaded connection. A cap has female threads and installs over a male-threaded connection.
Does the SP112 plug require welding?
No. It installs using its male NPT threaded connection and does not require welding for normal threaded installation.
Should thread sealant be used?
Use a thread-sealing method appropriate for the system media, pressure, temperature, fitting materials, and applicable installation requirements.
Can the plug be removed later?
Yes. The threaded design allows the plug to be removed when access to the connection is required, provided the installation and service conditions permit disassembly.
Important Ordering Notes
- This listing is for Charman Inc SP112 304 stainless steel 150# square head solid plugs.
- These fittings have male NPT connections.
- Select the required nominal pipe size from the available options.
- Available sizes range from 1/8" through 3".
- Confirm the mating opening has the correct female NPT size before ordering.
- Confirm adequate wrench clearance around the square head.
- Confirm that 304 stainless steel is compatible with the intended service and environment.
- Confirm system pressure and temperature requirements before installation.
- Use suitable thread sealant where required by the application.
- Review the linked Charman Inc stainless steel fittings specification sheet and complete catalog when additional product information is required.
- Installation should be completed in accordance with applicable piping practices and codes.
