Service Metal
300# Galvanized Malleable Couplings
- SKU:
- XGCPL
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
300# Galvanized Malleable Iron Coupling
300# Galvanized Malleable Iron Couplings are designed to connect two male-threaded pipes in a straight run within higher-duty piping systems where added corrosion resistance is required.
Manufactured from durable malleable iron with a hot-dip galvanized finish, these Class 300 couplings provide dependable strength and corrosion protection for plumbing, waterworks, HVAC, mechanical, industrial, compressed air, and outdoor piping applications.
Product Highlights
- Straight threaded coupling configuration
- Female NPT x female NPT connections
- Designed to join two male-threaded pipes of the same nominal size
- Designed for higher-duty Class 300 threaded piping systems
- Hot-dip galvanized finish for added corrosion resistance
- Durable malleable iron construction
- Malleable castings conform to ASTM A197
- Hot-dipped galvanized fittings conform to ASTM A153
- Malleable fitting dimensions conform to ASME B16.3
- NPT threads conform to ASME B1.20.1
- Class 300 fittings are UL Listed
- Suitable for water, air, HVAC, mechanical, and outdoor applications
- Approved to 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 | Threaded Coupling |
|---|---|
| Material | Malleable Iron |
| Finish | Hot-Dip Galvanized |
| Pressure Class | 300# |
| Connection Type | Female NPT x Female NPT |
| Configuration | Straight Coupling |
| Primary Function | Join Two Male-Threaded Pipes in a Straight Run |
| Casting Standard | ASTM A197 |
| Galvanizing Standard | ASTM A153 |
| Dimensional Standard | ASME B16.3 |
| Thread Standard | ASME B1.20.1 |
| Listing | Class 300 Fittings are UL Listed |
| 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 demanding threaded piping systems.
Straight Pipe Connection
Female NPT threads on both ends allow two compatible male-threaded pipes to be joined in line without changing pipe direction or nominal size.
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 Choose a 300# Galvanized Coupling?
Higher-Duty Construction
Class 300 malleable iron fittings are intended for more demanding threaded piping applications than standard Class 150 fittings.
Added Corrosion Resistance
The hot-dip galvanized coating helps protect the fitting in environments exposed to moisture, humidity, weather, and other conditions where bare black iron may be less suitable.
Typical Applications
Mechanical & Commercial Piping
- Mechanical piping systems
- Commercial plumbing
- HVAC piping
- Water distribution
- Compressed air systems
- General utility piping
Galvanized & Outdoor Applications
- Outdoor piping
- Moist environments
- Waterworks installations
- Industrial piping
- General galvanized piping systems
Ask Willy: Need Pipe Size Help?
Use our common pipe diameters and wall thickness chart to confirm sizing before ordering 300# galvanized malleable iron fittings. You can also review the coupling 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 fitting dimensions conform to ASME B16.3, while NPT threads conform to ASME B1.20.1.
UL & Lead Compliance
Class 300 fittings are UL Listed. Galvanized fittings are listed as meeting ANSI/NSF 61-4 Annex G and CA AB1953 requirements in the supplied product information.
Related Malleable Iron Standards
- Malleable bushings, plugs, and locknuts conform to ASME B16.14.
- Malleable unions conform to ASME B16.39.
- NPT threads on applicable fittings conform to ASME B1.20.1.
- Class 300 fittings are UL Listed according to the supplied product information.
Need More 300# Galvanized Malleable Iron Fittings?
Browse our complete selection of 300# galvanized malleable iron fittings, including couplings, elbows, tees, bushings, unions, and other heavy-duty threaded fittings.
Frequently Asked Questions
What is a 300# galvanized malleable iron coupling used for?
It is used to connect two compatible male-threaded pipes of the same nominal size in a straight run within a higher-duty threaded piping system.
What type of connections does this coupling use?
The coupling uses female NPT threaded connections on both ends.
Does a standard coupling reduce pipe size?
No. A standard coupling connects pipes of the same nominal size. Use a reducing coupling when two different pipe sizes must be joined.
How is a coupling different from a union?
A coupling creates a conventional threaded pipe connection. A union includes a separable center connection that allows adjoining piping sections to be disconnected more easily for maintenance.
Why choose galvanized instead of black malleable iron?
The hot-dip galvanized coating provides added protection against rust and corrosion in piping exposed to moisture, humidity, or outdoor conditions.
How is a 300# coupling different from a 150# coupling?
The Class 300 fitting is a heavier-duty fitting intended for more demanding threaded piping applications than a standard Class 150 fitting.
What material standard applies?
The supplied product information states that the malleable iron castings conform to ASTM A197.
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.
Are Class 300 fittings UL Listed?
Yes. The supplied product information states that Class 300 fittings are UL Listed.
Important Ordering & Installation Notes
- Confirm the required nominal pipe size before ordering.
- This standard coupling uses female NPT connections on both ends.
- It is intended to join two compatible male-threaded pipes of the same nominal size.
- Use a reducing coupling if different pipe sizes must be connected.
- Confirm that Class 300 construction is appropriate for the intended piping system.
- NPT threads conform to ASME B1.20.1.
- Malleable fitting dimensions conform to ASME B16.3.
- Hot-dipped galvanized fittings conform to ASTM A153.
- Use compatible galvanized pipe, fittings, and thread sealant appropriate for the intended system.
- Avoid damaging the galvanized coating during handling and installation.
- Do not assume the “300#” class designation alone establishes allowable working pressure for every service condition.
- Verify pressure, temperature, media compatibility, potable-water requirements, applicable codes, and approval requirements before installation.
- Refer to the specification sheet and Certificate of Conformance for additional product information.
