BFO Select
2-1/2 in. Weld End x 10 in. Flange Size - 150# Black Ductile Iron Reducing Companion Flange (AWWA C110 / ASME B16.42)
- SKU:
- BFO17RT1024100
- Availability:
- Available
- Weight:
- 18.00 LBS
Description
A reducing companion flange is a type of flange used in piping systems to connect pipes of different diameters. It typically has a bolted end connection on one side, which mates with a matching flange (often a standard companion flange) using bolts and a gasket to create a secure, leak-proof joint. The other side is designed to connect to a pipe, usually via a threaded or socket-weld connection, depending on the specific design. The "reducing" aspect refers to its ability to transition between different pipe sizes, with the flange face having a larger diameter than the pipe connection side. This makes it ideal for systems requiring a size reduction while maintaining a flanged connection
The size of a socket weld reducing companion flange is determined by two key dimensions: the nominal pipe size (NPS) of the socket weld end and the flange size (which corresponds to the larger pipe or equipment it connects to). Here's how it works:
- Socket Weld End Size:
- The socket weld end is sized based on the¬ÝNPS¬Ýof the smaller pipe it connects to. For example, if the socket weld end is designed for a 1-inch pipe, it’s specified as 1" NPS.
- The socket bore matches the pipe’s outer diameter (OD), and the socket depth accommodates the pipe’s insertion length per standards like ASME B16.11.
- Flange Size:
- The flange face is sized to match the larger pipe or equipment it bolts to, also specified by¬ÝNPS¬Ý(e.g., 2" NPS for a 2-inch flange).
- The flange’s dimensions (OD, bolt circle diameter, number of bolt holes) follow standards like ASME B16.5 or B16.47, depending on the pressure class (e.g., 150#, 300#).
- Reducing Specification:
- The reducing companion flange is identified by both sizes, e.g., “1” x 2”” indicates a 1-inch socket weld end and a 2-inch flange face.
- The flange’s bore on the socket side is reduced to match the smaller pipe, while the flange face aligns with the larger mating flange.
- Pressure Class:
- The flange’s pressure rating (e.g., Class 150, 300) must be specified, as it affects the flange’s thickness and bolt pattern. The socket weld end typically matches the schedule of the pipe (e.g., Sch 40, Sch 80).
BFO17RT1 Reducing Companion Flanges
The naming convention is as follows:
Welded End Size x Flange Size
Example: 1x5 would be a 5 inch flange that connects to a 1 in. welded connection.
BFO17TH1 Threaded Companion Flanges
The naming convention is as follows:
Threaded End Size x Flange Size
Example: 1x5 would be a 5 inch flange that connects to a 1 in. threaded connection.
Applications: Waterworks, Pump, Irrigation
Ductile Iron Flanges Class 150 & 300 Specifications:
- Ductile iron conform to ASTM A536
- Flange dimensions, drilling and materials in accordance with AWWA C110 / ASME B16.42
- Hot-dipped galvanized flanges conform to ASTM A153
- Companion flange threads conform to ASME B1.20.1
- Manufacturing facility is ISO 9001:2008
- These flanges are not UL Listed or FM Approved

- Individual items 0 - 150 lbs qualify for free shipping (US standard ground service orders - product and destination exclusions may apply).
- Individual items that weigh over 150 lbs must ship LTL freight with rates reflected at checkout.
- View complete list of shipping terms here
* Images provided are general product images and do not reflect the current line item size listed above.
* Dimensions are for reference only and subject to change.
Warranty Information

- You are entitled to quality products. If you find that the quality of your product is unacceptable contact us.
- Our products are warranted to be free of defects in material or workmanship upon delivery.
- Upon receiving the return shipment, inspection and confirmation of defective product - we will replace or refund your order.
- No warranty is included against expense for removal, re-installation or other consequential damages arising from any defect.
- This warranty is the sole warranty of QMC Technologies, Inc and its subsidiaries.
- Any other warranties expressed, implied in law or implied in fact, including any warrants of merchantability and fitness for use are hereby specifically excluded.
Additional Information
Size (inches): |
2.50 (2-1/2") |
Material Type: |
Ductile Iron |
Product Type: |
Reducing Companion Flange |
Category Type: |
Pipe Flanges |
Pressure Rating (psi): |
150 |
End Connection: |
Weld End x Flange Size |
Number of Bolt Holes: |
8 |
Flange Size (inches): |
10" |
Bolt Hole Size (inches): |
7/8" |
Weight (lbs): |
18"Specifications or Standards=AWWA C110 |
Additional: |
From Import |
Industry Crossover: |
4330000700 |