Flange Tables

Technical talk for metric pvc pipe

Flanges Tables


Flange tables are an often missed critical factor in any system build, and incorrectly ordered flanges can lead to delays on the job. Prior to specification or ordering of any plastic pipe flanges, the PCD / drilling of the connecting flange should be determined. The PCD is the measurement from the centre of one bolt hole, across the middle of the flange, to the centre of the opposite hole.

Diagram of Flange PCD Measurement

Flange Drillings in Different Parts of the World

The likelihood is that, if you are in Europe, the drilling will be either PN6, PN10 or PN16. If it is an old piece of equipment you are connecting the plastic pipe to, such as a pump or filter, the flange may be a BS10 drilling. If it is an imported piece of equipment from North America, the drilling could well be ASA150 (or ANSI). Once you have your PCD measurement, look it up on the flange drilling tables below.

Why You Need the Right Drilling

This is pretty straightforward. If you do not have the same drilling on both flanges, the bolt holes won't line up and you won't be able to connect them.

Flange Tables

Once you have your PCD measurement, look it up in the tables below to determine the drilling standard. Note: PN10/16 - Some flanges are denoted PN10/16. These refer to the fact that either PN10 or PN16 flanges will fit, as the drillings for many sizes are the same.

Pipe Size
Inch
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
5"
6"
8"
10"
PN6 Drilling
Metric
20
25
32
40
50
63
75
90
110
140
160
200
280
PCD mm
55
65
75
90
100
110
130
150
170
200
225
280
335
Bolt Diameter
M10
M10
M10
M12
M12
M12
M12
M16
M16
M16
M16
M16
M16
No. of bolts
4
4
4
4
4
4
4
4
4
8
8
8
12
Pipe Size
Inch
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
5"
6"
8"
10"
PN10 Drilling
Metric
20
25
32
40
50
63
75
90
110
140
160
200
280
PCD mm
65
75
85
100
110
125
145
160
180
210
240
295
350
Bolt Diameter
M12
M12
M12
M16
M16
M16
M16
M16
M16
M16
M20
M20
M20
No. of bolts
4
4
4
4
4
4
4
8
8
8
8
8
12
Pipe Size
Inch
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
5"
6"
8"
10"
PN16 Drilling
Metric
20
25
32
40
50
63
75
90
110
140
160
200
280
PCD mm
65
75
85
100
110
125
145
160
180
210
240
295
350
Bolt size
M12
M12
M16
M16
M16
M16
M16
M16
M16
M16
M20
M20
M20
Bolts
4
4
4
4
4
4
4
8
8
8
8
12
12
Pipe Size
Inch
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"(D)
4" (E)
5"
6"
8"
10"
BS10 Table D/E drilling
PCD mm
67
73
83
87
98
114
127
146
178
178
210
235
292
406
Bolt Diameter
M12
M12
M12
M12
M16
M16
M16
M16
M16
M16
M16
M16
M16
M20
No. of bolts
4
4
4
4
4
4
4
4
4
8
8
8
8
8
Pipe Size
Inch
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
5"
6"
8"
10"
ASA150 Drilling
PCD mm
60
70
80
90
98
121
138
152
190
216
241
298
364
Bolt Diameter
M12
M12
M12
M12
M16
M16
M16
M16
M16
M20
M20
M20
M24
No. of bolts
4
4
4
4
4
4
4
4
8
8
8
8
12
If you are still unsure of which flanges are right for your application, please call us - we are always happy to help and would rather you got the right ones first time!
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