Links to the flange dimensions charts maintained by Flange Bolt Chart for Class 150 flanges.
Class 0.5
Class 0.75
Class 1
Class 1.25
Class 1.5
Class 2
Class 2.5
Class 3
Class 3.5
Class 4
Class 5
Class 6
Class 8
Class 10
Class 12
Class 14
Class 16
Class 18
Class 20
Class 22
Class 24
Class 26
Class 28
Class 30
Class 32
Class 34
Class 36
Class 38
Class 40
Class 42
Class 44
Class 46
Class 48
Class 50
Class 52
Class 54
Class 56
Class 58
Class 60