Flanges are essential when connecting valves to pipework as they make future maintenance and removal easier. Standards vary worldwide and aren’t always interchangeable, which means you need to identify which flange standards you have.
Annotation of a flange in relation to flange table below
The use of a flange table can help you identify what standard you have based on features such as nominal pressure, pitch circle diameter (PCD) or the diameter of bolts or the raised face.
The tables below show PN flange dimensions to help you identify the standards that you have.
Do you need some help or advice with identifying your flange standards? Contact our team today.
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Nominal pressure
Flange diameter (mm)
PCD (mm)
No. of bolt holes
Diameter of bolts
Diameter of holes (mm)
Diameter of raised face (mm)
Height of raised face (mm)
1/2″ nominal bore (DN15)
PN6
80
55
4
M10
11
40
2
PN10
95
65
4
M12
14
45
2
PN16
95
65
4
M12
14
45
2
PN25
95
65
4
M12
14
45
2
3/4″ nominal bore (DN20)
PN6
90
65
4
M10
11
50
2
PN10
105
75
4
M12
14
58
2
PN16
105
75
4
M12
14
58
2
PN25
105
75
4
M12
14
58
2
1″ nominal bore (DN25)
PN6
100
75
4
M10
11
60
2
PN10
115
85
4
M12
14
68
2
PN16
115
85
4
M12
14
68
2
PN25
115
85
4
M12
14
68
2
1 1/4″ nominal bore (DN32)
PN6
120
90
4
M12
14
70
2
PN10
140
100
4
M16
18
78
2
PN16
140
100
4
M16
18
78
2
PN25
140
100
4
M16
18
78
2
1 1/2″ nominal bore (DN40)
PN6
130
100
4
M12
14
80
3
PN10
150
110
4
M16
18
88
3
PN16
150
110
4
M16
18
88
3
PN25
150
110
4
M16
18
88
3
2″ nominal bore (DN50)
PN6
140
110
4
M12
14
90
3
PN10
165
125
4
M16
18
102
3
PN16
165
125
4
M16
18
102
3
PN25
165
125
4
M16
18
102
3
2 1/2″ nominal bore (DN65)
PN6
160
130
4
M14
14
110
3
PN10
185
145
4
M18
18
122
3
PN16
185
145
4
M18
18
122
3
PN25
185
145
8
M18
18
122
3
3″ nominal bore (DN80)
PN6
190
150
4
M16
18
128
3
PN10
200
160
8
M16
18
138
3
PN16
200
160
8
M16
18
138
3
PN25
200
160
8
M16
18
138
3
4″ nominal bore (DN100)
PN6
210
170
4
M16
18
148
3
PN10
220
180
8
M16
18
158
3
PN16
220
180
8
M16
18
158
3
PN25
235
180
8
M20
22
162
3
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