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ANSI B16.5 flange dimensions

ANSI B16.5 flange dimensions

ASME/ANSI B16.5 provides dimensions and tolerances for flanges in pipe sizes from 1/2" through 24" and in classes ranging 150 through 2500.

Nominal Pipe Size NPS (inches)

Class 150

Diameter of Flange (inches)

No. of Bolts

Diameter of Bolts (inches)

Bolt Circle (inches)

1/4

3-3/8

4

1/2

2-1/4

1/2

3-1/2

4

1/2

2-3/8

3/4

3-7/8

4

1/2

2-3/4

1

4-1/4

4

1/2

3-1/8

1-1/4

4-5/8

4

1/2

3-1/2

1-1/2

5

4

1/2

3-7/8

2

6

4

5/8

4-3/4

2-1/2

7

4

5/8

5-1/2

3

7-1/2

4

5/8

6

4

9

8

5/8

7-1/2

5

10

8

3/4

8-1/2

6

11

8

3/4

9-1/2

8

13-1/2

8

3/4

11-3/4

10

16

12

7/8

14-1/4

12

19

12

7/8

17

14

21

12

1

18-3/4

16

23-1/2

16

1

21-1/4

18

25

16

1-1/8

22-3/4

20

27-1/2

20

1-1/8

25

24

32

20

1-1/4

29-1/2

Nominal Pipe Size NPS (inches)

Class 300

Diameter of Flange (inches)

No. of Bolts

Diameter of Bolts (inches)

Bolt Circle (inches)

1/4

3-3/8

4

1/2

2-1/4

1/2

3-3/4

4

1/2

2-5/8

3/4

4-5/8

4

5/8

3-1/4

1

4-7/8

4

5/8

3-1/2

1-1/4

5-1/4

4

5/8

3-7/8

1-1/2

6-1/8

4

3/4

4-1/2

2

6-1/2

8

5/8

5

2-1/2

7-1/2

8

3/4

5-7/8

3

8-1/4

8

3/4

6-5/8

4

10

8

3/4

7-7/8

5

11

8

3/4

9-1/4

6

12-1/2

12

3/4

10-5/8

8

15

12

7/8

13

10

17-1/2

16

1

15-1/4

12

20-1/2

16

1-1/8

17-3/4

14

23

20

1-1/8

20-1/4

16

25-1/2

20

1-1/4

22-1/2

18

28

24

1-1/4

24-3/4

20

30-1/2

24

1-1/4

27

24

36

24

1-1/2

32

Nominal Pipe Size NPS (inches)

Class 400

Diameter of Flange (inches)

No. of Bolts

Diameter of Bolts (inches)

Bolt Circle (inches)

1/4

3-3/8

4

1/2

2-1/4

1/2

3-3/4

4

1/2

2-5/8

3/4

4-5/8

4

5/8

3-1/4

1

4-7/8

4

5/8

3-1/2

1-1/4

5-1/4

4

5/8

3-7/8

1-1/2

6-1/8

4

3/4

4-1/2

2

6-1/2

8

5/8

5

2-1/2

7-1/2

8

3/4

5-7/8

3

8-1/4

8

3/4

6-5/8

4

10

8

7/8

7-7/8

5

11

8

7/8

9-1/4

6

12-1/2

12

7/8

10-5/8

8

15

12

1

13

10

17-1/2

16

1-1/8

15-1/4

12

20-1/2

16

1-1/4

17-3/4

14

23

20

1-1/4

20-1/4

16

25-1/2

20

1-3/8

22-1/2

18

28

24

1-3/8

24-3/4

20

30-1/2

24

1-1/2

27

24

36

24

1-3/4

32

Nominal Pipe Size NPS (inches)

Class 600

Diameter of Flange (inches)

No. of Bolts

Diameter of Bolts (inches)

Bolt Circle (inches)

1/4

3-3/8

4

1/2

2-1/4

1/2

3-3/4

4

1/2

2-5/8

3/4

4-5/8

4

5/8

3-1/4

1

4-7/8

4

5/8

3-1/2

1-1/4

5-1/4

4

5/8

3-7/8

1-1/2

6-1/8

4

3/4

4-1/2

2

6-1/2

8

5/8

5

2-1/2

7-1/2

8

3/4

5-7/8

3

8-1/4

8

3/4

6-5/8

4

10-3/4

8

7/8

8-1/2

5

13

8

1

10-1/2

6

14

12

1

11-1/2

8

16-1/2

12

1-1/8

13-3/4

10

20

16

1-1/4

17

12

22

20

1-1/4

19-1/4

14

23-3/4

20

1-3/8

20-3/4

16

27

20

1-1/2

23-3/4

18

29-1/4

20

1-5/8

25-3/4

20

32

24

1-5/8

28-1/2

24

37

24

1-7/8

33

Nominal Pipe Size NPS (inches)

Class 900

Diameter of Flange (inches)

No. of Bolts

Diameter of Bolts (inches)

Bolt Circle (inches)

1/2

4-3/4

4

3/4

3-1/4

3/4

5-1/8

4

3/4

3-1/2

1

5-7/8

4

7/8

4

1-1/4

6-1/4

4

7/8

4-3/8

1-1/2

7

4

1

4-7/8

2

8-1/2

8

7/8

6-1/2

2-1/2

9-5/8

8

1

7-1/2

3

9-1/2

8

7/8

7-1/2

4

11-1/2

8

1-1/8

9-1/4

5

13-3/4

8

1-1/4

11

6

15

12

1-1/8

12-1/2

8

18-1/2

12

1-3/8

15-1/2

10

21-1/2

16

1-3/8

18-1/2

12

24

20

1-3/8

21

14

25-1/4

20

1-1/2

22

16

27-3/4

20

1-5/8

24-1/2

18

31

20

1-7/8

27

20

33-3/4

20

2

29-1/2

24

41

20

2-1/2

35-1/2

Nominal Pipe Size NPS (inches)

Class 1500

Diameter of Flange (inches)

No. of Bolts

Diameter of Bolts (inches)

Bolt Circle (inches)

1/2

4-3/4

4

3/4

3-1/4

3/4

5-1/8

4

3/4

3-1/2

1

5-7/8

4

7/8

4

1-1/4

6-1/4

4

7/8

4-3/8

1-1/2

7

4

1

4-7/8

2

8-1/2

8

7/8

6-1/2

2-1/2

9-5/8

8

1

7-1/2

3

10-1/2

8

1-1/8

8

4

12-1/4

8

1-1/4

9-1/2

5

14-3/4

8

1-1/2

11-1/2

6

15-1/2

12

1-3/8

12-1/2

8

19

12

1-5/8

15-1/2

10

23

12

1-7/8

19

12

26-1/2

16

2

22-1/2

14

29-1/2

16

2-1/4

25

16

32-1/2

16

2-1/2

27-3/4

18

36

16

2-3/4

30-1/2

20

38-3/4

16

3

32-3/4

24

46

16

3-1/2

39

Nominal Pipe Size NPS (inches)

Class 2500

Diameter of Flange (inches)

No. of Bolts

Diameter of Bolts (inches)

Bolt Circle (inches)

1/2

5-1/4

4

3/4

3-1/2

3/4

5-1/2

4

3/4

3-3/4

1

6-1/4

4

7/8

4-1/4

1-1/4

7-1/4

4

1

5-1/8

1-1/2

8

4

1-1/8

5-3/4

2

9-1/4

8

1

6-3/4

2-1/2

10-1/2

8

1-1/8

7-3/4

3

12

8

1-1/4

9

4

14

8

1-1/2

10-3/4

5

16-1/2

8

1-3/4

12-3/4

6

19

8

2

14-1/2

8

21-3/4

12

2

17-1/4

10

26-1/2

12

2-1/2

21-1/4

12

30

12

2-3/4

24-3/8

 

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