ANSI B16.5 Flange Dimensional Data Table

DN = diameter nominal (size)
A = flange
b = thickness of flange
D2 = diameter of raised face
D1 = diameter of bolt circle
n = number of bolts
d = diameter of bolt holes
h = height of raised face (RF)
h* =1/16" = 1.6 mm for ANSI Class 150 - 300
h* = 1/4" = 6.4 mm for ANSI Class 400 - 2500
* for steel flanges only

b = raised face included for ANSI Class 150 - 300
b = raised face not included for ANSI Class 400 2500




DN
(inch)

Dimension

ANSI B16.5 Flange Dimensional Sizes 3 to 10 inches Table Chart

125 lbs
150 lbs

300 lbs

400 lbs

600 lbs

900 lbs

1500 lbs

2500 lbs

inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm

3

A
7 1/2
190.5
81/4
209.6
81/4
209.6
8 1/4
209.6
9 1/2
241
10 1/2
267
12
305
b
15/16
23.8
1 1/8
28.6
11/4
31.8
1 1/4
31.8
1 1/2
38.1
1 7/8
47.6
2 5/8
66.7
D2
5
127
5
127
5
127
5
127
5
127
5
127
5
127
D1
6
152.4
6 5/8
168.3
6 5/8
168.3
6 5/8
168.3
71/2
190.5
8
203
9
228.6
n
4
4
8
8
8
8
8
8
8
8
8
8
8
8
d
3/4
19
7/8
22.2
7/8
22.2
7/8
22.2
1
25.4
1 1/4
31.8
1 3/8
34.9

3 1/2

A
8 1/2
215.9
9
228.6
9
228.6
9
228.6
-
-
-
-
-
-
b
15/16
23.8
13/16
30.2
13/8
34.9
13/8
34.9
-
-
-
-
-
-
D2
5 1/2
139.7
5 /2
139.7
5 1/2
139.7
5 1/2
139.7
-
-
-
-
-
-
D1
7
177.8
7 1/4
184.2
7 1/4
184.2
7 1/4
184.2
-
-
-
-
-
-
n
8
8
8
8
8
8
8
8
-
-
-
-
-
-
d
3/4
19
7/8
22.2
1
25.4
1
25.4
-
-
-
-
-
-

4

A
9
228.6
10
254
10
254
10 3/4
273
11 1/2
292
12 1/4
311
14
356
b
15/16
23.8
1 1/4
31.7
1 3/8
34.9
1 1/2
38.1
1 3/4
44.4
2 1/8
54
3
76.2
D2
6 3/16
157.2
6 3/16
157.2
6 3/16
157.2
6 3/16
157.2
6 3/16
157.2
6 3/16
157.2
6 3/16
157.2
D1
7 1/2
190
7 7/8
200
7 7/8
200
8 1/2
215.9
9 1/4
235
9 1/2
241
10 3/4
273
n
8
8
8
8
8
8
8
8
8
8
8
8
8
8
d
3/4
19
7/8
22.2
1
25.4
1
25.4
1 1/4
31.8
1 3/8
34.9
1 5/8
41.3

5

A
10
254
11
279.4
11
279.4
13
330.2
13 3/4
349
14 3/4
375
16 1/2
419
b
1 5/16
23.8
13/8
34.9
1 1/2
38.1
1 3/4
44.4
2
50.8
2 7/8
73
3 5/8
92.1
D2
7 5/16
185.7
7 5/16
185.7
7 5/16
185.7
7 5/16
185.7
7 5/16
185.7
7 5/16
185.7
7 5/16
185.7
D1
8 1/2
215.9
9 1/4
234.9
9 1/4
234.9
10 1/2
266.7
11
279
11 1/2
292
12 3/4
324
n
8
8
8
8
8
8
8
8
8
8
8
8
8
8
d
7/8
22.2
7/8
22.2
1
25.4
1 1/8
28.6
1 3/8
34.9
1 5/8
41.3
1 7/8
47.6

6

A
11
279
12 1/2
317.5
12 1/2
317.5
14
355.6
15
381
15 1/2
394
19
483
b
1
25.4
17/16
36.5
1 5/8
41.3
1 7/8
47.6
2 3/16
55.6
3 1/4
82.6
4 1/4
108
D2
8 1/2
216
8 1/2
215.9
8 1/2
215.9
8 1/2
215.9
8 1/2
215.9
8 1/2
215.9
8 1/2
216
D1
9 1/2
241
10 5/8
269.9
10 5/8
269.9
11 1/2
292.1
12 1/2
318
12 1/2
318
14 1/2
368
n
8
8
12
12
12
12
12
12
12
12
12
12
8
8
d
7/8
22.2
7/8
22.2
1
25.4
1 1/8
28.6
1 1/4
31.8
1 1/2
38.1
2 1/8
54

8

A
13 1/2
342.9
15
381
15
381
16 1/2
419
18 1/2
470
19
482.6
21 3/4
552
b
1 1/8
28.6
1 5/8
41.3
1 7/8
47.6
2 3/16
55.6
2 1/2
63.5
3 5/8
92.1
5
127
D2
10 5/8
269.9
10 5/8
269.9
10 5/8
269.9
10 5/8
269.9
10 5/8
269.9
10 5/8
269.9
10 5/8
269.9
D1
11 3/4
298.4
13
330.2
13
330.2
13 3/4
349.2
15 1/2
394.2
15 1/2
394.2
17 1/4
438
n
8
8
12
12
12
12
12
12
12
12
12
12
12
12
d
7/8
22.2
1
25.4
1 1/8
28.6
1 1/4
31.8
1 1/2
38.1
1 3/4
44.5
2 1/8
54

10

A
16
406.4
17 1/2
444.5
17 1/2
444.5
20
508
21 1/2
546
23
584
26 1/2
673
b
1 3/16
30.2
1 7/8
47.6
2 1/8
54
2 1/2
63.5
2 3/4
69.8
4 1/4
108
6 1/2
165
D2
12 3/4
323.8
12 3/4
323.8
12 3/4
323.8
12 3/4
323.8
12 3/4
323.8
12 3/4
323.8
12 3/4
323.8
D1
14 1/4
361.9
15 1/4
387.4
15 1/4
387.4
17
431.8
18 1/2
470
19
482.6
21 1/4
540
n
12
12
16
16
16
16
16
16
16
16
12
12
12
12
d
1
25.4
1 1/8
28.6
1 1/4
31.8
1 3/8
34.9
1 1/2
38.1
2
50.8
2 5/8
66.7

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