Service Metal
150# Galvanized Malleable Square Head Plugs
- SKU:
- SGSHP
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
150# Galvanized Malleable Iron Square Head Cored Plug
150# Galvanized Malleable Iron Square Head Cored Plugs are designed to securely close female-threaded pipe or fitting openings while providing a square head for convenient wrench installation and removal.
Manufactured from durable malleable iron with a hot-dip galvanized finish, these Class 150 plugs provide dependable strength and added corrosion resistance for industrial, commercial, plumbing, mechanical, water, and outdoor piping applications.
Product Highlights
- Male NPT threaded plug for closing female-threaded openings
- Square head design for wrench installation and removal
- Cored plug construction
- Useful for unused outlets, drain ports, and access openings
- Suitable for temporary or permanent threaded closures
- Hot-dip galvanized finish for added corrosion resistance
- Durable malleable iron construction
- Class 150 fitting
- Malleable castings conform to ASTM A197
- Hot-dipped galvanized fittings conform to ASTM A153
- Malleable plugs conform to ASME B16.14
- NPT threads conform to ASME B1.20.1
- Class 150 fittings are UL Listed and FM Approved at 300 PSI
- Galvanized fittings meet ANSI/NSF 61-4 Annex G and CA AB1953 (<0.25% lead)
- Manufactured in an ISO-certified facility
- Country of origin: Thailand & China
Technical Specifications
| Product Type | Square Head Cored Plug |
|---|---|
| Material | Malleable Iron |
| Finish | Hot-Dip Galvanized |
| Pressure Class | 150# |
| Connection Type | Male NPT |
| Head Style | Square Head |
| Construction | Cored Plug |
| Primary Function | Seal Female-Threaded Pipe or Fitting Openings |
| Casting Standard | ASTM A197 |
| Galvanizing Standard | ASTM A153 |
| Plug Standard | ASME B16.14 |
| Thread Standard | ASME B1.20.1 |
| Listings / Approvals | UL Listed & FM Approved at 300 PSI |
| Lead / Potable Water Compliance | ANSI/NSF 61-4 Annex G and CA AB1953 (<0.25% lead) |
| Manufacturing | ISO-Certified Facility |
| Country of Origin | Thailand & China |
Construction & Applications
Malleable Iron Construction
Manufactured from malleable iron castings conforming to ASTM A197 for dependable strength and durability in threaded piping installations.
Square Head Design
The square head provides external wrench flats for tightening and removal, making the plug convenient for access points that may require future service.
Hot-Dip Galvanized Finish
The galvanized coating conforms to ASTM A153 and provides added protection against rust and corrosion in moisture-prone and outdoor environments.
Why Use a Square Head Plug?
Threaded Opening Closure
A square head plug threads directly into a compatible female NPT opening to close an unused port, branch, drain connection, or access point.
Easy Future Removal
The raised square head gives a wrench a positive gripping surface, making the plug easier to remove later for maintenance, inspection, draining, or system modification.
Typical Applications
Commercial & Mechanical Piping
- Commercial plumbing systems
- Mechanical piping
- Water distribution systems
- Unused fitting outlets
- Drain ports
- Maintenance access points
Galvanized Applications
- Outdoor piping
- Moist environments
- Water-service applications
- Industrial installations
- General galvanized piping systems
Ask Willy: Need Pipe Size Help?
Use our common pipe diameters and wall thickness chart to confirm sizing before ordering galvanized malleable iron fittings. You can also review the square head plug specification sheet and Certificate of Conformance below.
Standards & Approvals
ASTM Standards
Malleable iron castings conform to ASTM A197, while hot-dipped galvanized fittings conform to ASTM A153.
ASME Standards
Malleable plugs conform to ASME B16.14, while NPT threads conform to ASME B1.20.1.
UL, FM & Lead Compliance
Class 150 fittings are UL Listed and FM Approved at 300 PSI. Galvanized fittings meet ANSI/NSF 61-4 Annex G and CA AB1953 requirements listed in the supplied product information.
Related Malleable Iron Standards
- Malleable fitting dimensions conform to ASME B16.3 where applicable.
- Malleable bushings, plugs, and locknuts conform to ASME B16.14.
- Malleable unions conform to ASME B16.39.
- Class 300 fittings are UL Listed according to the supplied product information.
- NPT threads on applicable fittings conform to ASME B1.20.1.
Need More Galvanized Malleable Iron Fittings?
Shop our complete selection of 150# galvanized malleable iron fittings, including plugs, caps, tees, elbows, couplings, bushings, unions, and other threaded fittings.
Frequently Asked Questions
What is a square head cored plug used for?
A square head cored plug is used to close a female-threaded pipe or fitting opening, such as an unused outlet, drain port, or service access point.
What type of connection does this plug use?
The plug uses a male NPT threaded connection.
What is the difference between a pipe plug and a pipe cap?
A plug has male threads and installs into a female-threaded opening. A cap has female threads and installs over a male-threaded pipe end.
Why does the plug have a square head?
The square head provides wrench flats that make the plug easier to tighten and remove during installation or maintenance.
What does “cored plug” mean?
Cored refers to the fitting's hollowed internal casting construction rather than a fully solid plug body.
Can this plug be removed for maintenance?
Yes. The threaded design and square wrench head allow the plug to be removed when access is needed, provided the piping system has first been safely isolated and depressurized.
What standard applies specifically to malleable iron plugs?
The supplied product information states that malleable bushings, plugs, and locknuts conform to ASME B16.14.
What standard applies to the galvanized coating?
Hot-dipped galvanized fittings conform to ASTM A153 according to the supplied product information.
What thread standard applies?
NPT threads conform to ASME B1.20.1.
Is this fitting UL Listed and FM Approved?
The supplied product information states that Class 150 fittings are UL Listed and FM Approved at 300 PSI.
Important Ordering & Installation Notes
- Confirm the required nominal thread size before ordering.
- This plug uses male NPT threads and is designed for a compatible female-threaded opening.
- Do not confuse a plug with a cap; plugs are male threaded while caps are female threaded.
- Use the square head for wrench engagement rather than gripping the threaded surface.
- Malleable plugs conform to ASME B16.14 according to the supplied product information.
- NPT threads conform to ASME B1.20.1.
- Hot-dipped galvanized fittings conform to ASTM A153.
- Use compatible galvanized pipe, fittings, thread sealant, and accepted threaded installation practices.
- Avoid damaging the galvanized coating during handling and installation.
- Depressurize and isolate the piping system before removing an installed plug.
- Verify system pressure, service, potable-water, code, and approval requirements before installation.
- Refer to the specification sheet and Certificate of Conformance for additional product information.
