Merit Brass
150# Stainless Steel Flat Face Threaded Flanges
- SKU:
- 435-635
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
150# Stainless Steel Flat Face Threaded Flanges
150# Stainless Steel Flat Face Threaded Flanges provide a bolted flange connection for threaded stainless steel piping systems without requiring the flange to be welded to the pipe. The threaded bore allows compatible male-threaded pipe to be installed directly into the flange, while the flat-face sealing surface is designed for use with compatible flat-face mating flanges and gaskets.
These flanges are available in 304 and 316 stainless steel, use a 150# flange pattern, and are manufactured from material conforming to ASTM A351. The manufacturing facility is listed as ISO 9001:2008.
Product Highlights
- 150# stainless steel threaded flange
- MSS flat-face flange configuration
- Female threaded pipe connection
- Available in 304 and 316 stainless steel
- Material conforms to ASTM A351
- Allows flange installation without welding to the pipe
- Flat-face sealing surface
- Designed for compatible bolted flange connections
- Corrosion-resistant stainless steel construction
- Suitable for commercial and industrial piping systems
- Manufactured in an ISO 9001:2008 facility
Technical Specifications
| Product Type | Flat Face Threaded Flange |
|---|---|
| Pressure Class | 150# |
| Face Style | Flat Face (FF) |
| Flange Pattern | 150# |
| Material | Stainless Steel |
| Available Grades | 304 & 316 Stainless Steel |
| Material Standard | ASTM A351 |
| Pipe Connection | Female Threaded |
| Flange Connection | Bolted |
| Manufacturing Facility | ISO 9001:2008 |
Threaded Flange Construction
A threaded flange incorporates a female threaded bore that accepts compatible male-threaded pipe. This allows the flange to be attached without welding the flange directly to the pipe.
The threaded configuration can simplify installation and servicing in applications where welding is undesirable or impractical, provided the threaded connection is suitable for the system design and operating conditions.
These flanges are manufactured from stainless steel material conforming to ASTM A351 and are available in 304 and 316 stainless steel grades.
Flat Face Flange Design
Flat Face Sealing Surface
- Flat sealing surface across the flange face
- Designed for use with compatible flat-face mating flanges
- Accepts an appropriate flange gasket between mating surfaces
- Bolted flange connection permits future disassembly
- Confirm gasket type and mating flange compatibility before installation
Threaded Pipe Connection
- Female threaded flange bore
- Installs onto compatible male-threaded pipe
- Does not require flange-to-pipe welding
- Useful for serviceable threaded piping systems
- Thread compatibility should be verified before installation
304 vs. 316 Stainless Steel
304 Stainless Steel
304 stainless steel is commonly selected for general-purpose commercial and industrial piping systems requiring corrosion-resistant stainless steel construction.
316 Stainless Steel
316 stainless steel is commonly selected where increased corrosion resistance is required, including more demanding chemical, process, marine, or chloride-exposed service conditions.
Threaded Flange vs. Welded Flange
Threaded Flange
- Threads directly onto compatible pipe
- No flange-to-pipe welding required
- Useful where welding is undesirable or impractical
- Provides a bolted flange connection for system access
- Requires compatible pipe threads
Welded Flange
- Attached to pipe by welding
- Requires suitable welding procedures
- Common in permanent welded piping systems
- Available in multiple flange configurations
- Different installation method from a threaded flange
Common Applications
Commercial & General Piping
- Commercial plumbing systems
- Water piping systems
- Mechanical piping installations
- Threaded equipment connections
- Serviceable bolted flange joints
Industrial & Process Applications
- Industrial process piping
- Corrosion-resistant piping systems
- Valve and equipment connections
- Utility piping systems
- Applications where flange welding is not preferred
Installation & Selection Guidance
- Confirm the required nominal pipe size before ordering.
- Select the appropriate 304 or 316 stainless steel grade for the operating environment.
- Verify that the pipe threads are compatible with the flange bore.
- Confirm that a 150# flange pattern is appropriate for the mating component.
- Use a compatible flat-face mating flange and gasket.
- Confirm bolt size, bolt pattern, and gasket requirements before assembly.
- Use appropriate thread sealant where required for the threaded pipe connection.
- Follow an appropriate flange bolt tightening sequence to achieve even gasket compression.
- Verify pressure, temperature, and media compatibility for the complete piping system.
- Installation should be completed in accordance with applicable piping codes and project requirements.
Product Documents
Stainless Steel ANSI Flange Dimensions
Review the manufacturer dimensional reference for stainless steel flanges, including applicable flange dimensions and bolt-pattern information.
Flange Selection Reference
Use the flange dimensional document to confirm the selected nominal size, outside diameter, bolt circle, bolt-hole configuration, and other applicable dimensions before ordering.
Need Help Selecting a Stainless Steel Threaded Flange?
Our industrial PVF specialists can help review your pipe size, stainless steel grade, flange pattern, mating flange, gasket, and threaded connection requirements before you order.
Frequently Asked Questions
What is a threaded flange?
A threaded flange has a female threaded bore that allows it to install directly onto compatible male-threaded pipe without welding the flange to the pipe.
What pressure class is this flange?
This flange uses a 150# flange pattern.
What does FF mean?
FF means flat face. The sealing surface is flat across the flange face rather than incorporating a raised sealing surface.
What stainless steel grades are available?
These flanges are available in 304 and 316 stainless steel.
What material specification applies?
The supplied product information states that the material conforms to ASTM A351.
Does a threaded flange need to be welded to the pipe?
No. The flange installs onto compatible male-threaded pipe using its female threaded bore.
Can this flange be disassembled later?
Yes. The bolted flange joint can be disassembled for maintenance or equipment access, although the threaded flange remains attached to the pipe unless it is unthreaded.
What gasket should be used?
Gasket selection depends on the mating flange, system media, pressure, temperature, and applicable piping requirements. Confirm that the gasket is suitable for a flat-face flange connection.
What is the difference between 304 and 316 stainless steel?
Both are corrosion-resistant stainless steel grades. 316 is commonly selected for more demanding chemical, marine, chloride-exposed, and corrosive service environments.
Where can I find flange dimensions?
Use the Stainless Steel ANSI Flange Dimensions document in the Product Documents section above.
Important Ordering Notes
- Product is a 150# stainless steel flat-face threaded flange.
- MSS flat-face configuration.
- Available in 304 and 316 stainless steel.
- Material conforms to ASTM A351.
- Manufacturing facility is listed as ISO 9001:2008.
- Confirm nominal pipe size before ordering.
- Verify pipe thread compatibility with the flange bore.
- Confirm the 150# bolt pattern matches the mating flange or equipment connection.
- Use a compatible flat-face gasket and mating flange.
- Verify system pressure, temperature, and media compatibility before installation.
- Refer to the Stainless Steel ANSI Flange Dimensions document for applicable dimensional information.
