WORLD STANDARD FLANGE DIMENSIONS
US ANSI:  B.16 CLASS 150 and 300; BRITISH TABLES D, E & F: METRIC:   DIN & PN; JAPANESE:  JIS; KOREAN:  KS

MDS-20w

These tables have been prepared in an effort to familiarize engineers with some of the world standards and American equivalents.  In a few cases, dimensions will differ from these tables, particularly in sizes over 48".  It is safest to work from certified prints before fabricating mating rubber or metal flanges.  Thicknesses are omitted because of conflicting information in published tables.

Nominal Equivalent Pipe Diameters
Nominal
Pipe Size		 Nominal
Pipe Size		 Nominal
Pipe Size		 Nominal
Pipe Size
(in) (mm) (in) (mm) (in) (mm) (in) (mm)
1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2		 6
8
10
15
20
25
32
40
50
65
80
90		 4
5
6
7
8
9
10
12
14
16
18
20		 100
125
150
175
200
225
250
300
350
400
450
500		 22
24
26
28
30
32
34
36
40
48
56
64		 550
600
650
700
750
800
850
900
1000
1200
1400
1600		 72
80
88
96
104
112
120
128
136
144		 1800
2000
2200
2400
2600
2800
3000
3200
3400
3600


American ANSI B.16

Class 125 or 150
Nominal
Pipe Size
(in)		 Flange
Outside
Dia.
(in)		 Bolt
Circle
Dia.
(in)		 No. of
Holes		 Bolt
Hole
Dia.
(in)		 Bolt
Dia.
(in)
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56		 4 5/8
5
6
7
7 1/2
8 1/2
9
10
11
13 1/2
16
19
21
23 1/2
25
27 1/2
29 1/2
32
34 1/4
36 1/2
38 3/4
41 3/4
43 3/4
46
48 3/4
50 3/4
53
55 1/4
57 1/4
59 1/2
61 3/4
64
66 1/4
68 3/4		 3 1/2
3 7/8
4 3/4
5 1/2
6
7
7 1/2
8 1/2
9 1/2
11 3/4
14 1/4
17
18 3/4
21 1/4
22 3/4
25
27 1/4
29 1/4
31 3/4
34
36
38 1/2
40 1/2
42 3/4
45 1/4
47 1/4
49 1/2
51 3/4
53 3/4
56
58 1/4
60 1/2
62 3/4
65		 4
4
4
4
4
8
8
8
8
8
12
12
12
16
20
20
20
24
28
28
28
32
32
32
36
36
40
40
44
44
44
44
44
48		 5/8
5/8
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1 1/8
1 1/8
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 7/8
1 7/8
1 7/8
1 7/8		 1/2
1/2
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
7/8
7/8
1
1
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 3/4
1 3/4
1 3/4
1 3/4

Class 125 or 150 cont'd
Nominal
Pipe Size
(in)		 Flange
Outside
Dia.
(in)		 Bolt
Circle
Dia.
(in)		 No. of
Holes		 Bolt
Hole
Dia.
(in)		 Bolt
Dia.
(in)
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
102
108
120
132
144		 71
73
75 1/4
78
80
82 1/4
84 1/2
86 1/2
88 1/2
90 3/4
93
95 1/4
97 1/2
99 3/4
102
104 1/4
106 1/2
108 3/4
111
113 1/4
115 1/2
117 3/4
120
126 3/4
140 1/4
153 3/4
167 1/4		 67 1/4
69 1/4
71 3/4
74
76
78 1/4
80 1/2
82 1/2
84 1/2
86 1/2
88 3/4
91
93 1/4
95 1/2
97 3/4
100
102 1/4
104 1/2
106 1/4
108 1/2
110 3/4
113
114 1/2
120 3/4
132 3/4
145 3/4
158 1/4		 48
52
52
52
52
56
56
60
60
60
60
60
60
64
64
68
68
68
68
68
68
68
72
72
76
80
84		 1 7/8
2
2
2
2
2
2
2
2
2
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/4
2 1/4
2 1/4
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2		 1 3/4
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
2
2
2
2
2
2
2 1/8
2 1/8
2 1/8
2 1/4
2 1/4
2 1/4
2 1/4
2 1/4
2 1/4
2 1/4
2 1/4

Class 250 or 300
Nominal
Pipe Size
(in)		 Flange
Outside
Dia.
(in)		 Bolt
Circle
Dia.
(in)		 No. of
Holes		 Bolt
Hole
Dia.
(in)		 Bolt
Dia.
(in)
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48		 5 1/4
6 1/8
6 1/2
7 1/2
8 1/4
9
10
11
12 1/2
15
17 1/2
20 1/2
23
25 1/2
28
30 1/2
33
36
38 1/4
403/4
43
45 1/4
47 1/2
50
52 1/4
54 1/2
57
59 1/4
61 1/2
65		 3 7/8
4 1/2
5
5 7/8
6 5/8
7 1/4
7 7/8
9 1/4
10 5/8
13
15 1/4
17 3/4
20 1/4
22 1/2
24 3/4
27
29 1/4
32
34 1/2
37
39 1/4
41 1/2
43 1/2
46
48
50 1/4
52 3/4
55
57 1/4
60 3/4		 4
4
8
8
8
8
8
8
12
12
16
16
20
20
24
24
24
24
28
28
28
28
28
32
32
36
36
36
40
40		 3/4
7/8
3/4
7/8
7/8
7/8
7/8
7/8
7/8
1
1 1/8
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 3/4
1 3/4
1 7/8
2
2
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8		 5/8
3/4
5/8
3/4
3/4
3/4
3/4
3/4
3/4
7/8
1
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
1 5/8
1 5/8
1 3/4
1 7/8
1 7/8
2
2
2
2
2
2
2

Dimension tables for sizes above 24" are in wide disagreement.  Refer to certified prints applicable to each job.

British Imperial flanges BS 10


Table D
Nominal
Pipe Size
(in)		 Flange
Outside
Dia.
(in)		 Bolt
Circle
Dia.
(in)		 No. of
Holes		 Bolt
Hole
Dia.
(in)		 Bolt
Dia.
(in)
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
7
8
9
10
12
14
15
16
18
20
21
24		 4 3/4
5 1/4
6
6 1/2
7 1/4
8
8 1/2
10
11
12
13 1/4
14 1/2
16
18
20 3/4
21 3/4
22 3/4
25 1/4
27 3/4
29
32 1/2		 3 7/16
3 7/8
4 1/2
5
5 3/4
6 1/2
7
8 1/4
9 1/4
10 1/4
11 1/2
12 3/4
14
16
18 1/2
19 1/2
20 1/2
23
25 1/4
26 1/2
29 3/4		 4
4
4
4
4
4
4
8
8
8
8
8
8
12
12
12
12
12
16
16
16		 5/8
5/8
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
7/8
7/8
1
1
1
1
1
1
1 1/8		 1/2
1/2
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/4
3/4
7/8
7/8
7/8
7/8
7/8
7/8
1

Table E
Nominal
Pipe Size
(in)		 Flange
Outside
Dia.
(in)		 Bolt
Circle
Dia.
(in)		 No. of
Holes		 Bolt
Hole
Dia.
(in)		 Bolt
Dia.
(in)
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
20
21
22
23
24
27
29
30
33
35
36
39
42
45
48		 4 3/4
5 1/4
6
6 1/2
7 1/4
8
8 1/2
10
11
12
13 1/4
14 1/2
16
18
19 1/4
20 3/4
21 3/4
22 3/4
24
25 1/4
26 1/2
27 3/4
29
30
31
32 1/2
35 3/4
38 1/4
39 1/4
43
45
46 1/4
49 1/2
52 1/2
55 3/4
58 3/4		 3 7/16
3 7/8
4 1/2
5
5 3/4
6 1/2
7
8 1/4
9 1/4
10 1/4
11 1/2
12 3/4
14
16
17 1/4
18 1/2
19 1/2
20 1/2
21 3/4
23
24
25 1/4
26 1/2
27 1/2
28 1/2
29 3/4
33 1/4
35 1/2
36 1/2
40
42
43
46 1/4
49 1/4
52 1/2
55 1/2		 4
4
4
4
4
8
8
8
8
8
8
12
12
12
12
12
12
12
12
16
16
16
16
16
16
16
20
20
20
20
24
24
24
28
28
32		 5/8
5/8
3/4
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
7/8
7/8
1
1
1
1
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/2
1 1/2
1 1/2
1 1/2		 1/2
1/2
5/8
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
1
1
1
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8

Table F
Nominal
Pipe Size
(in)		 Flange
Outside
Dia.
(in)		 Bolt
Circle
Dia.
(in)		 No. of
Holes		 Bolt
Hole
Dia.
(in)		 Bolt
Dia.
(in)
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
20
21
22
23
24
27
29
30
33
35
36
39
42
45
48		 5 1/4
5 1/2
6 1/2
7 1/4
8
8 1/2
9
11
12
13 1/4
14 1/2
16
17
19 1/4
20 3/4
21 3/4
22 3/4
24
25 1/4
26 1/2
27 3/4
29
30
31
32 1/2
33 1/2
36 3/4
39
40
43
45 3/4
46 3/4
50 1/4
53 1/4
57
60 1/4		 3 7/8
4 1/8
5
5 3/4
6 1/2
7
7 1/2
9 1/4
10 1/4
11 1/2
12 3/4
14
15
17 1/4
18 1/2
19 1/2
20 1/2
21 3/4
23
24
25 1/4
26 1/2
27 1/2
28 1/2
29 3/4
30 3/4
33 3/4
36
37
40
42 1/2
43 1/2
47
50
53 1/2
56 3/4		 4
4
4
8
8
8
8
8
12
12
12
12
12
16
16
16
16
20
20
20
20
24
24
24
24
24
24
24
28
32
32
32
36
36
36
40		 3/4
3/4
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
7/8
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/2
1 1/2
1 1/2
1 1/2
1 5/8
1 5/8		 5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 1/2
1 1/2

 


Metric flanges SABS 1123, BS 4504,
DIN 2501
No data available on SABS sizes above 600mm

DIN or PN 6 (6 Bar)
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
32
40
50
65
80
100
125
150
200
250
300
350
400
450
500
600		 120
130
140
160
190
210
240
265
320
375
440
490
540
595
645
755		 90
100
110
130
150
170
200
225
280
335
395
445
495
550
600
705		 4
4
4
4
4
4
8
8
8
12
12
12
16
16
20
20		 14
14
14
14
18
18
18
18
18
18
22
22
22
22
22
26		 M12
M12
M12
M12
M16
M16
M16
M16
M16
M16
M20
M20
M20
M20
M20
M24

DIN or PN 6 (6 Bar) cont'd
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
700
800
900
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600		 860
975
1075
1175
1405
1630
1830
2045
2265
2475
2685
2905
3115
3315
3525
3735
3970		 810
920
1020
1120
1340
1560
1760
1970
2180
2390
2600
2810
3020
3220
3430
3640
3860		 24
24
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80		 26
30
30
30
33
36
36
39
42
42
42
48
48
48
48
48
56		 M24
M27
M27
M27
M30
M33
M33
M36
M39
M39
M39
M45
M45
M45
M45
M45
M52
 

DIN or PN 10 (10 Bar)
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
32
40
50
65
80
100
125
150
175
200
250
300
350
400
450
500
600
700
800
900
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000		 140
150
165
185
200
220
250
285
315
340
395
445
505
565
615
670
780
895
1015
1115
1230
1455
1675
1915
2115
2325
2550
2760
2960
3180
3405		 100
110
125
145
160
180
210
240
270
295
350
400
460
515
565
620
725
840
950
1050
1160
1380
1590
1820
2020
2230
2440
2650
2850
3070
3290		 4
4
4
4
8
8
8
8
8
8
12
12
16
16
20
20
20
24
24
28
28
32
36
40
44
48
52
56
60
64
68		 18
18
18
18
18
18
18
22
22
22
22
22
22
26
26
26
30*
30
33
33
36
39
42
48
48
48
56
56
56
56
62		 M16
M16
M16
M16
M16
M16
M16
M20
M20
M20
M20
M20
M20
M24
M24
M24
M27*
M27
M30
M30
M33
M36
M39
M45
M45
M45
M52
M52
M52
M52
M56

*Note SABS 1123 deviations:
600 size 10 bar hole diameter is 26 mm for M24 bolt.

 

DIN or 16 (16 Bar)
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
32
40
50
65
80
100
125
150
175
200
250
300
350
400
450
500
600
700
800
900
1000
1200
1400
1600
1800
2000
2200		 140
150
165
185
200
220
250
285
315
340
405
460
520
580
640
715
840
910
1025
1125
1255
1485
1685
1930
2130
2345
2555		 100
110
125
145
160
180
210
240
270
295
355
410
470
525
585
650
770
840
950
1050
1170
1390
1590
1820
2020
2230
2440		 4
4
4
4
8
8
8
8
8
12
12
12
16
16
20
20
20
24
24
28
28
32
36
40
44
48
52		 18
18
18
18
18
18
18
22
22
22
26
26
26
30*
30*
33
36*
36
39
39
42
48
48
56
56
62
62		 M16
M16
M16
M16
M16
M16
M16
M20
M20
M20
M20
M24
M24
M24
M27*
M27*
M30
M33*
M33
M36
M39
M45
M45
M52
M52
M56
M56

*Note SABS 1123 deviations:
400 and 450 size 16 bar hole diameter is 26 mm for M24 bolt.
600 size 16 bar hole diameter is 33 mm for M30 bolt.

 

DIN or PN 25 (25 Bar)
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
32
40
50
65
80
100
125
150
175
200
250
300
350
400
450
500
600
700
800
900
1000
1200
1400
1600
1800
2000		 140
150
165
185
200
235
270
300
330
360
425
485
555
620
670
730
845
960
1085
1185
1320
1530
1775
1975
2195
2425		 100
110
125
145
160
190
220
250
280
310
370
430
490
550
600
660
770
875
990
1090
1210
1420
1640
1870
2070
2300		 4
4
4
8
8
8
8
8
12
12
12
16
16
16
20
20
20
24
24
28
28
32
36
40
44
48		 18
18
18
18
18
22
26
26
26
26
30*
30*
33
36*
36
36*
39
42
48
48
56
56
62
62
70
70		 M16
M16
M16
M16
M16
M20
M24
M24
M24
M24
M27*
M27*
M30
M33*
M33
M33*
M36
M39
M45
M45
M52
M52
M56
M56
M64
M64

*Note SABS 1123 deviations:
250 and 300 size 25 bar hole diameter is 26 mm for M24 bolt.
400 and 500 size 25 bar hole diameter is 33 mm for M30 bolt.

 

DIN or 40 (40 Bar)
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
32
40
50
65
80
100
125
150
175
200
250
300
350
400
450
500
600
700
800
900
1000
1200
1400
1600		 140
150
165
185
200
235
270
300
350
375
450
515
580
660
685
755
890
995
1140
1250
1360
1575
1795
2025		 100
110
125
145
160
190
220
250
295
320
385
450
510
585
610
670
795
900
1030
1140
1250
1460
1680
1900		 4
4
4
8
8
8
8
8
12
12
12
16
16
16
20
20
20
24
24
28
28
32
36
40		 18
18
18
18
18
22
26
26
30
30
33
33
36
39
39
42
48
48
56
56
56
62
62
70		 M16
M16
M16
M16
M16
M20
M24
M24
M27
M27
M30
M30
M33
M36
M36
M39
M45
M45
M52
M52
M52
M56
M56
M64

 


Japanese and Korean flanges
JIS-B-2212, JIS-B-2214 & KS-B-1503

JIS 10 & KOREAN 10 KGF/cm2
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
10
15
20
25
32
40
50
65
80
90
100
125
150
175
200
225
250
300
350
400
450
500
550
600
650
700
750
800
850
900
1000		 90
95
100
125
135
140
155
175
185
195
210
250
280
305
330
350
400
445
490
560
620
675
745
795
845
905
970
1020
1070
1120
1235		 65
70
75
90
100
105
120
140
150
160
175
210
240
265
290
310
355
400
445
510
565
620
680
730
780
840
900
950
1000
1050
1180		 4
4
4
4
4
4
4
4
8
8
8
8
8
12
12
12
12
16
16
16
20
20
20
24
24
24
24
28
28
28
28		 15
15
15
19
19
19
19
19
19
19
19
23
23
23
23
23
25
25
25
27
27
27
33
33
33
33
33
33
33
33
39		 M12
M12
M12
M16
M16
M16
M16
M16
M16
M16
M16
M20
M20
M20
M20
M20
M22
M22
M22
M24
M24
M24
M30
M30
M30
M30
M30
M30
M30
M30
M36

JIS 20 & KOREAN 20 Kgf/cm2
Nominal
Pipe Size
(mm)		 Flange
Outside
Dia.
(mm)		 Bolt
Circle
Dia.
(mm)		 No. of
Holes		 Bolt
Hole
Dia.
(mm)		 Bolt
Dia.
(mm)
10
15
20
25
32
40
50
65
80
90
100
125
150
200
250
300
350
400
450
500
550
600		 90
95
100
125
135
140
155
175
200
210
225
270
305
350
430
480
540
605
675
730
795
845		 65
70
75
90
100
105
120
140
160
170
185
225
260
305
380
430
480
540
605
660
720
770		 4
4
4
4
4
4
8
8
8
8
8
8
12
12
12
16
16
16
20
20
20
24		 15
15
15
19
19
19
19
19
23
23
23
25
25
25
27
27
33
33
33
33
39
39		 M12
M12
M12
M16
M16
M16
M16
M16
M20
M20
M20
M22
M22
M22
M24
M24
M30
M30
M30
M30
M36
M36