Description
Kerkau A105 Pipe Flange Reducer Adapter 2.5" to 4" ASME B16.5 Class 150
This is a Kerkau carbon steel reducing pipe flange adapter that transitions from a 2.5-inch pipe connection to a 4-inch pipe connection. Manufactured to ASME B16.5 Class 150 standards from A105 carbon steel, it features raised faces on both ends for use with standard raised-face gaskets. The flange markings stamped on the unit read A105 2.5-150 STD, confirming the material grade, nominal size, and pressure class.
Specifications & What's Included
- Brand: Kerkau
- Material: Carbon Steel, ASTM A105
- Standard: ASME B16.5
- Pressure Class: 150
- Face Type: Raised Face (both ends)
- Small end inner diameter: 2.5 in
- Small end outer diameter: 7.0 in
- Small end raised face diameter: 4.125 in
- Large end inner diameter: 4.0 in
- Large end outer diameter: 9.0 in
- Large end raised face diameter: 6.1875 in
- Bolt hole diameter: 0.75 in
- Overall dimensions: 9 x 9 x 4.75 in
- Flange adapter only — no gaskets or fasteners included
Applications
Reducing pipe flange adapters like this one are used in industrial piping systems where a pipeline transitions between two different nominal pipe sizes within the same flanged assembly. They are standard components in oil and gas, chemical processing, water treatment, power generation, and general industrial plant piping. ASME B16.5 is the governing standard for steel pipe flanges and flanged fittings used in North American industrial applications, covering dimensional and material requirements for Class 150 through Class 2500 pressure ratings. A105 is a common carbon steel grade specified for ambient- and elevated-temperature service in pressure piping and vessel applications. Class 150 flanges are rated for moderate pressure service and are among the most common flange classes found in process piping. This type of reducing flange allows a direct bolted connection between 2.5-inch and 4-inch flanged piping components without requiring a separate reducer spool piece.
This Kerkau A105 carbon steel pipe flange reducer adapter (2.5" to 4", ASME B16.5 Class 150) is in used condition, pulled from industrial service. The photos show significant surface rust and oxidation across the reducer neck and both flange faces, along with paint loss, white mineral residue inside the bore, and general wear consistent with prior field use. The flange faces and bolt holes are intact, and the stamped markings (A105 2.5-150 STD) are legible. No gaskets or fasteners are included. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
Kerkau |
Model: |
B16.5 A105 2.5" to 4" |
MPN: |
A105 2.5-150 STD |
Type: |
Pipe Flange Reducer Adapter |
SKU: |
48470 |
Material: |
Carbon Steel A105 |
Standard: |
ASME B16.5 |
Pressure Class: |
Class 150 |
Face Type: |
Raised Face |
Pipe Size (Small End): |
2.5 inch |
Pipe Size (Large End): |
4 inch |
Inner Diameter (Small End): |
2.5 in |
Outer Diameter (Small End): |
7.0 in |
Raised Face Diameter (Small End): |
4.125 in |
Inner Diameter (Large End): |
4.0 in |
Outer Diameter (Large End): |
9.0 in |
Raised Face Diameter (Large End): |
6.1875 in |
Bolt Hole Diameter: |
0.75 in |
Overall Dimensions: |
9 x 9 x 4.75 in |
Condition: |
Used – Pulled from Working Environment |
Seller Notes: |
Flange adapter only; no gaskets or fasteners included. |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Kerkau A105 pipe flange reducer 2.5" to 4", B16.5 Class 150. Used, pulled from industrial service. Heavy surface rust on neck and faces; bore shows white residue. Flanges and bolt holes intact. No gaskets or hardware included. |
