Links to the flange dimensions charts maintained by Flange Bolt Chart.
NPS 0.5
NPS 0.75
NPS 1
NPS 1.25
NPS 1.5
NPS 2
NPS 2.5
NPS 3
NPS 3.5
NPS 4
NPS 5
NPS 6
NPS 8
NPS 10
NPS 12
NPS 14
NPS 16
NPS 18
NPS 20
NPS 22
NPS 24
NPS 26
NPS 28
NPS 30
NPS 32
NPS 34
NPS 36
NPS 38
NPS 40
NPS 42
NPS 44
NPS 46
NPS 48
NPS 50
NPS 52
NPS 54
NPS 56
NPS 58
NPS 60
Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500