Merit Brass
150# Stainless Steel Union ISO 49
- SKU:
- K487-K687
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
150# Stainless Steel Union ISO 49
150# Stainless Steel Unions are standard-pattern cast fittings designed to create a threaded connection that can be disconnected without cutting or disturbing adjoining piping. The three-piece union design simplifies installation, maintenance, equipment replacement, and system servicing in commercial, industrial, and process piping applications.
The fitting family is available in AISI 304 or 316 stainless steel, conforms to ISO 49-1983 (E) dimensional requirements, and is listed as low lead certified to NSF/ANSI 61.
Product Highlights
- 150# stainless steel threaded union
- Standard-pattern cast fitting design
- Three-piece configuration allows piping to be disconnected without cutting
- Suitable for maintenance and equipment replacement applications
- Available in AISI 304 or 316 stainless steel
- Low lead certified to NSF/ANSI 61
- Dimensions conform to ISO 49-1983 (E)
- Corrosion-resistant stainless steel construction
- Helps prevent contamination from rust, scale, and small particles
- Resists corrosive attack from many industrial and chemical solutions and mixtures
- Provides strength at elevated temperatures
- Designed for long service life and straightforward maintenance
Technical Specifications
| Product Type | Threaded Union |
|---|---|
| Pressure Class | 150# |
| Material | Stainless Steel |
| Material Grades | AISI 304 or 316 |
| Dimensional Standard | ISO 49-1983 (E) |
| Construction Style | Standard Pattern Cast Fitting |
| Union Design | Three-Piece Threaded Assembly |
| Primary Function | Removable In-Line Piping Connection |
| Certification | Low Lead Certified NSF/ANSI 61 |
Three-Piece Union Design
A union provides a removable connection between two sections of threaded piping. Unlike a standard coupling, the union can be separated at the center connection without rotating or removing the adjoining pipe sections.
This three-piece design makes unions especially useful near valves, pumps, filters, equipment, and other components that may require future service or replacement.
Union vs. Standard Coupling
Union
- Designed to be disconnected after installation
- Three-piece fitting configuration
- Does not require adjoining pipe to be rotated for disassembly
- Useful near serviceable equipment and components
Standard Coupling
- Creates a straight threaded pipe connection
- Typically remains assembled during normal service
- Usually requires pipe rotation or additional disassembly for removal
- Best suited for more permanent pipe extensions
304 vs. 316 Stainless Steel
304 Stainless Steel
- General-purpose stainless steel grade
- Strong corrosion resistance for many applications
- Commonly used in water and process piping
- Suitable for many commercial and industrial environments
316 Stainless Steel
- Enhanced corrosion resistance
- Commonly selected for more aggressive environments
- Useful in many chemical and process applications
- Often selected for marine or chloride-exposed service
Stainless Steel Construction
The stainless steel construction provides corrosion resistance while helping reduce contamination associated with rust, scale, and small particles that can occur with some other metallic piping materials.
The supplied product information states that the material resists corrosive attack from hundreds of industrial and chemical solutions and mixtures and provides greater strength at elevated temperatures.
NSF/ANSI 61 Low Lead Certification
This fitting is listed as low lead certified to NSF/ANSI 61, supporting use in compatible potable-water applications where applicable system and code requirements are met.
Always confirm the requirements for the complete piping system, local codes, operating conditions, and media compatibility before installation.
ISO 49 Standard Pattern
Dimensions conform to ISO 49-1983 (E), providing dimensional consistency for compatible standard-pattern cast stainless steel fittings.
Use the manufacturer document below to confirm union dimensions before ordering or installation.
Common Applications
Commercial & General Piping
- Water piping systems
- Commercial plumbing
- Equipment connections
- Valve and pump connections
- Threaded stainless steel piping assemblies
Industrial & Process Service
- Industrial process piping
- Chemical handling systems
- Water treatment equipment
- Corrosion-resistant piping systems
- Applications requiring periodic maintenance or disassembly
Need Help With Fitting Selection?
Confirm the nominal pipe size, 150# pressure class, required stainless steel grade, mating thread size, operating temperature, media compatibility, and applicable system requirements before ordering.
Use the product documents below to review standard-pattern cast fitting dimensions and common pipe diameter and wall thickness information.
Product Documents
Merit Stainless Steel Standard Pattern Cast Fittings
Use this manufacturer reference for dimensional and product information covering Merit standard-pattern cast stainless steel fittings.
- Standard-pattern cast fitting information
- Useful for confirming union dimensions
- Supports ISO 49 fitting selection
- Recommended for dimensional review before ordering
Pipe Chart: Common Diameters & Wall Thicknesses
Use this pipe chart to confirm common nominal pipe sizes, outside diameters, and wall thicknesses when working with compatible piping components.
- Common pipe outside diameters
- Reference wall thickness information
- Useful for confirming piping system dimensions
- Recommended before ordering or installation
Frequently Asked Questions
What is a stainless steel union used for?
A union is used to connect two sections of threaded piping while allowing the connection to be separated later for maintenance, inspection, or equipment replacement.
What pressure class is this union?
This fitting is listed as a 150# stainless steel union.
How is a union different from a coupling?
A union can be disconnected at its center connection without rotating the adjoining pipe sections. A standard coupling is generally used as a more permanent straight-line connection.
What stainless steel grades are available?
The fitting family is available in AISI 304 or 316 stainless steel.
What dimensional standard applies?
The fitting dimensions conform to ISO 49-1983 (E).
Is this fitting low lead certified?
Yes. The supplied product information lists the fitting as low lead certified to NSF/ANSI 61.
Why are unions commonly installed near equipment?
A union allows connected piping to be separated without cutting the pipe, making service or replacement of valves, pumps, filters, and other equipment easier.
What is the difference between 304 and 316 stainless steel?
Both provide corrosion resistance, while 316 stainless steel is commonly selected for more aggressive chemical, marine, or chloride-exposed environments.
Where can I find union dimensions?
Use the Merit Stainless Steel Standard Pattern Cast Fittings PDF in the Product Documents section above.
How can I confirm common pipe dimensions?
Use the Pipe Chart: Common Diameters & Wall Thicknesses PDF in the Product Documents section above.
Important Ordering Notes
- Product type: 150# Stainless Steel Union.
- Three-piece design provides a removable threaded piping connection.
- Available in AISI 304 or 316 stainless steel.
- Low lead certified to NSF/ANSI 61.
- Dimensions conform to ISO 49-1983 (E).
- Stainless steel construction provides corrosion resistance.
- Confirm nominal pipe size, stainless steel grade, thread compatibility, and system pressure before ordering.
- Verify operating temperature, media compatibility, and applicable piping requirements before installation.
- Verify potable-water and local-code requirements when used in drinking-water systems.
- Refer to both Product Documents for fitting and pipe dimensional information.
