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.
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 |
