24 inch Class 150 flange dimensions
ASME B16.5 Class 150 flange dimensions for 24 inch (DN 600) pipe. The same bolting dimensions apply to weld neck, slip-on, blind, socket weld, threaded and lap joint flanges of this size and class.
| Nominal size | 24" (DN 600) |
| Pipe OD (bore end) | 610.0 mm |
| Flange outside diameter | 815 mm (32.09 in) |
| Minimum thickness (incl. 1.6 mm RF) | 46.1 mm (1.81 in) |
| Bolt circle diameter (PCD) | 749.3 mm (29.50 in) |
| Number of bolt holes | 20 |
| Bolt hole diameter | 1.38 in (35.1 mm) |
| Stud bolt diameter | 1-1/4" UNC |
| Raised face height | 1.6 mm (1/16 in) |
A complete 24" Class 150 joint needs 20 stud bolts of 1-1/4" diameter with 40 heavy hex nuts and one gasket.
Class 150 vs Class 300 — 24"
| Dimension | Class 150 | Class 300 |
|---|---|---|
| OD | 815 mm | 915 mm |
| Thickness | 46.1 mm | 68.3 mm |
| Bolt circle | 749.3 mm | 812.8 mm |
| Bolts | 20 × 1-1/4" | 24 × 1-1/2" |
Class 150 and Class 300 flanges do not bolt together — see 24" Class 300.
Frequently asked questions
What is the OD of a 24 inch Class 150 flange?
815 mm (32.09 in) per ASME B16.5.
How many bolts does a 24 inch Class 150 flange have?
20 bolts of 1-1/4 inch diameter in 1.38 inch holes on a 749.3 mm bolt circle.
What is the thickness of a 24 inch Class 150 flange?
The minimum flange thickness is 46.1 mm, including the 1.6 mm raised face.
Last updated 2026-11-02