ANSI B16.5 Flange Dimensional Sizes 1/2 to 2 1/2 inches Table Chart

ANSI Standard Hardware Menu

The following is chart data for ANSI B16.5 Flange Dimensional Data Size table for 1/2 to 2 1/2 inches.

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

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

ANSI B16.5 Flange Dimensional Data Size table

DN
(inch)

Dimension

ANSI B16.5 Flange Dimensional Sizes 1/2 to 2 1/2 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

1/2

A
3 1/2
88.9
3 3/4
95.2
3 3/4
95.2
3 3/4
95.2
4 3/4
121
4 3/4
121
5 1/4
133.4
b
7/16
11.1
9/16
14.3
9/16
14.3
9/16
14.3
7/8
22.2
7/8
22.2
1 3/16
30.2
D2
1 3/8
34.9
1 3/8
34.9
1 3/8
34.9
1 3/8
34.9
1 3/8
34.9
1 3/8
34.9
1 3/8
34.9
D1
2 3/8
60.3
2 5/8
66.7
2 5/8
66.7
2 5/8
66.7
3 1/4
82.6
3 1/4
82.6
3 1/2
88.9
n
4
4
4
4
4
4
4
4
4
4
4
-
4
44
d
5/8
15.9
5/8
15.9
5/8
15.9
5/8
15.9
7/8
22.2
7/8
22.2
7/8
22.2

3/4

A
3 7/8
98.4
4 5/8
117.5
4 5/8
117.5
4 5/8
117.5
5 1/8
130
5 1/8
130
5 1/2
139.7
b
1/2
12.7
5/8
15.9
5/8
15.9
5/8
15.9
1
25.4
1
25.4
1 1/4
31.8
D2
1 11/16
42.9
1 11/16
42.9
1 11/16
42.9
1 11/16
42.9
1 11/16
42.9
1 11/16
42.9
1 11/16
42.9
D1
2 3/4
69.8
3 1/4
82.5
3 1/4
82.5
3 1/4
82.5
3 1/2
88.9
3 1/2
88.9
3 3/4
95.2
n
4
4
4
4
4
4
4
4
4
4
4
-
4
44
d

5/8

15.9

3/4

19

3/4

19

3/4

19

7/8

22.2

7/8

22.2

7/8

22.2

1

A
4 1/4
108
4 7/8
123.8
4 7/8
123.8
4 7/8
123.8
5 7/8
149.2
5 7/8
149.2
6 1/4
159
b
9/16
14.3
11/16
17.5
11/16
17.5
11/16
17.5
1 1/8
28.6
1 1/8
28.6
1 3/8
34.9
D2
2
50.8
2
50.8
2
50.8
2
50.8
2
50.8
2
50.8
2
50.8
D1
3 1/8
79.4
3 1/2
88.9
3 1/2
88.9
3 1/2
88.9
4
102
4
102
4 1/4
108
n
4
4
4
4
4
4
4
4
4
4
4
4
4
4
d

5/8

15.9

3/4

19

3/4

19

3/4

19

1

25.4

1

25.4

1

25.4

1 1/4

A
4 5/8
117.5
5 1/4
133.4
5 1/4
133.4
5 1/4
133.4
6 1/4
159
6 1/4
159
7 1/4
184.2
b
5/8
15.9
3/4
19
13/16
20.6
13/16
20.6
1 1/8
28.6
1 1/8
28.6
1 1/2
38.1
D2
2 1/2
63.5
2 1/2
63.5
2 1/2
63.5
2 1/2
63.5
2 1/2
63.5
2 1/2
63.5
2 1/2
63.5
D1
3 1/2
88.9
3 7/8
98.4
3 7/8
98.4
3 7/8
98.4
4 3/8
111
4 3/8
111
5 1/8
130
n
4
4
4
4
4
4
4
4
4
4
4
4
4
4
d

5/8

15.9

3/4

19

3/4

19

3/4

19

1

25.4

1

25.4

1 1/8

28.6

1 1/2

A
5
127
6 1/8
155.6
6 1/8
155.6
6 1/8
155.6
7
177.8
7
177.8
8
203
b
11/16
17.5
13/16
20.6
7/8
22.2
7/8
22.2
1 1/4
31.8
1 1/4
31.8
1 3/4
44.5
D2
2 7/8
73 98
2 7/8
73
2 7/8
73
2 7/8
73
2 7/8
73
2 7/8
73
2 7/8
73
D1
3 7/8
4
4 1/2
114
4 1/2
114
4 1/2
114
4 7/8
124
4 7/8
124
5 3/4
146
n
4
4
4
4
4
4
4
4
4
4
4
4
4
4
d

5/8

. 15.9

7/8

22.2

7/8

22.2

7/8

22.2

1 1/8

28.6

1 1/8

28.6

1 1/4

31.8

2

A
6
152.4
6 1/2
165.1
6 1/2
165.1
6 1/2
165.1
8 1/2
215.9
8 1/2
215.9
9 1/4
234.9
b
3/4
19
7/8
22.2
1
25.4
1
25.4
1 1/2
38.1
1 1/2
38.1
2
50.8
D2
3 5/8
92.1
3 5/8
92.1
3 5/8
92.1
3 5/8
92.1
3 5/8
92.1
3 5/8
92.1
3 5/8
92.1
D1
4 3/4
121
5
127
5
127
5
127
6 1/2
165.1
6 1/2
165.1
6 3/4
171
n
4
4
8
8
8
8
8
8
8
8
8
8
8
8
d

3/4

19

3/4

19

3/4

19

3/4

19

1

25.4

1

25.4

1 1/8

28.6

2 1/2

A
7
177.8
7 1/2
190.5
7 1/2
190.5
7 1/2
190.5
9 5/8
244
9 5/8
244
10 1/2
266.7
b
7/8
22.2
1
25.4
1 1/8
28.6
1 1/8
28.6
1 5/8
41.3
1 5/8
41.3
2 1/4
57.2
D2
4 1/8
104.8
4 1/8
104.8
4 1/8
104.8
4 1/8
104.8
4 1/8
105
4 1/8
105
4 1/8
105
D1
5 1/2
139.7
5 7/8
149.2
5 7/8
149.2
5 7/8
149.2
7 1/2
190.5
7 1/2
190.5
7 3/4
197
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 1/8

28.6

1 1/8

28.6

1 1/4

31.8

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