ASC
300# Galvanized Malleable Iron Union
- Availability:
- Usually in Stock – Ships Quickly
- Weight:
- 0.00 LBS
Description
300# Galvanized Malleable Iron Union
300# galvanized malleable iron unions connect two same-size male NPT threaded pipes, pipe nipples, valves, or fittings while allowing the piping connection to be separated without rotating the connected components. The three-piece union design provides a durable, serviceable connection for demanding commercial, industrial, mechanical, fire-protection, maintenance, and repair applications where corrosion resistance and a galvanized finish are required.
Select the required nominal pipe size from the product options above. The selected variation determines the ASC item number, online selling price, estimated weight, net cost, and other size-specific product information.
Product Highlights
- 300# / Class 300 galvanized malleable iron construction
- Female NPT threaded connections on both ends
- Three-piece union design allows piping disconnection without rotating connected components
- Joins two same-size male-threaded components in a straight line
- Galvanized finish provides added corrosion resistance
- Designed for demanding threaded piping applications
- Manufactured to ASME B16.3 requirements
- Threads conform to ASME B1.20.1
- Malleable iron material conforms to ASTM A197
- UL Listed
- ASC Figure 3459
- Available in nominal pipe sizes from 1/8" through 4"
Technical Specifications
| Material | Galvanized Malleable Iron |
|---|---|
| Pressure Class | 300# / Class 300 |
| Connection | Female NPT x Female NPT |
| Fitting Type | Union |
| Function | Serviceable Straight Pipe Connection |
| Thread Standard | ASME B1.20.1 |
| Dimensional Standard | ASME B16.3 |
| Material Standard | ASTM A197 |
| Finish | Galvanized |
| Listing | UL Listed |
| Manufacturer | ASC |
| Figure Number | 3459 |
| Available Sizes | 1/8" through 4" |
How a Threaded Union Works
A threaded union consists of two female NPT end pieces and a center union nut. Each end piece threads onto a compatible male-threaded pipe, pipe nipple, valve, or fitting. Tightening the center nut draws the two union halves together to create a secure inline connection. Loosening the nut allows the piping connection to be separated without rotating or disturbing the connected piping components.
Common Applications
Commercial and Mechanical Systems
- Mechanical-room piping
- Water and utility piping
- Compressed-air systems
- Equipment and valve connections
- Pump and equipment piping
- General repair and maintenance
Industrial and Fire-Protection Service
- Industrial process piping
- Fire-protection piping where approved
- Oil and petroleum piping
- Compatible gas service
- Approved steam service
- Galvanized piping installations
Product Resources
Review the ASC threaded fittings catalog for dimensions, weights, standards, and additional product information before installation.
Need Help Selecting a 300# Galvanized Malleable Iron Union?
Our industrial PVF specialists can help confirm the required pipe size, pressure class, thread type, material compatibility, service conditions, and product availability.
Frequently Asked Questions
What is a 300# galvanized malleable iron union used for?
It joins two compatible same-size male NPT threaded components while allowing the connection to be separated without rotating the connected piping.
Does this union have female threads on both ends?
Yes. ASC Figure 3459 has female NPT threaded connections on both ends.
What is the advantage of a union compared with a coupling?
A union can be disconnected by loosening the center nut, while a standard coupling generally requires one of the connected components to be rotated or removed.
What is the benefit of the galvanized finish?
The galvanized finish provides added corrosion resistance compared with an unfinished black malleable iron fitting.
What pressure class is this fitting?
This fitting is manufactured as a 300# / Class 300 threaded malleable iron fitting.
What sizes are available?
Available product variations range from 1/8" through 4" nominal pipe size.
What standards and listings apply?
The fitting conforms to ASME B16.3, ASTM A197, and ASME B1.20.1 requirements. ASC lists its Class 300 malleable iron fittings as UL Listed.
Should thread sealant be used during installation?
Use an approved pipe-thread sealant or thread tape selected for the piping media, pressure, temperature, applicable codes, and manufacturer recommendations.
Important Ordering Notes
- Select the required nominal pipe size before adding the product to your cart.
- This union has female NPT threaded connections on both ends.
- The selected variation determines the ASC item number, online selling price, estimated weight, and net cost.
- Confirm that both mating components have the same nominal pipe size and compatible male NPT threads.
- Confirm that a serviceable union connection is appropriate for the required piping layout.
- Confirm pressure, temperature, media compatibility, and application requirements before installation.
- Use an approved thread sealant suitable for the piping media and operating conditions.
- Do not use the union nut to compensate for misaligned piping.
- Support connected piping properly to avoid excessive mechanical stress on the union.
- Installation should be completed by qualified personnel and comply with applicable codes and standards.
