English

Standard Flange Dimensions

Standard Flange Dimensions

NOMINAL PIPE SIZE

25/125/150 LB. DRILLING

250/300 LB. DRILLING
 

COMMON SIZE

BOLT HOLE DIAMETER

  
   

DRILLING COLUMN

  
 

O.D.

B.C. DIA.

NO. B.H.

1

2

3

4

O.D.

B.C. DIA.

NO. B.H.

B.H. DIA.

1/4

2-1/2

1-11/16

4

7/16

              

3/8

2-1/2

1-11/16

4

7/16

              

1/2

3-1/2

2-3/8

4

5/8

  

5/8

  

3-3/4

2-5/8

4

5/8

3/4

3-7/8

2-3/4

4

5/8

  

5/8

  

4-5/8

3-1/4

4

3/4

1

4-1/4

3-1/8

4

5/8

  

5/8

  

4-7/8

3-1/2

4

3/4

11/4

4-5/8

3-1/2

4

5/8

  

5/8

  

5-1/4

3-7/8

4

3/4

11/2

5

3-7/8

4

5/8

  

5/8

  

6-1/8

4-1/2

4

7/8

2

6

4-3/4

4

3/4

  

3/4

  

6-1/2

5

8

3/4

21/2

7

5-1/2

4

3/4

  

3/4

  

7-1/2

5-7/8

8

7/8

3

7-1/2

6

4

3/4

  

3/4

  

8-1/4

6-5/8

8

7/8

31/2

8-1/2

7

8

3/4

  

3/4

  

9

7-1/4

8

7/8

4

9

7-1/2

8

3/4

3/4

3/4

3/4

10

7-7/8

8

7/8

41/2

                      

5

10

8-1/2

8

7/8

3/4

7/8

3/4

11

9-1/4

8

7/8

51/2

                      

6

11

9-1/2

8

7/8

3/4

7/8

3/4

12-1/2

10-5/8

12

7/8

61/2

                      

7

                      

71/2

                      

8

131/2

11-3/4

8

7/8

3/4

7/8

3/4

15

13

12

1

81/2

                      

9

                      

91/2

                      

10

16

14-1/4

12

1

3/4

1

3/4

17-1/2

15-1/4

16

1-1/8

11

                      

12

19

17

12

1

3/4

1

3/4

20-1/2

17-3/4

16

1-1/4

14

21

18-3/4

12

1-1/8

7/8

1-1/8

7/8

23

20-1/4

20

1-1/4

16

23-1/2

21-1/4

16

1-1/8

7/8

1-1/8

7/8

25-1/2

22-1/2

20

1-3/8

18

25

22-3/4

16

1-1/4

7/8

1-1/4

7/8

28

24-3/4

24

1-3/8

20

27-1/2

25

20

1-1/4

7/8

1-1/4

7/8

30-1/2

27

24

1-3/8

22

29-1/2

27-1/4

20

    

1-3/8

7/8

33

29-1/4

24

1-5/8

24

32

29-1/2

20

1-3/8

7/8

1-3/8

7/8

36

32

24

1-5/8

25

                      

26

34-1/4

31-3/4

24

    

1-3/8

7/8

38-1/4

34-1/2

28

1-3/4

28

36-1/2

34

28

    

1-3/8

7/8

40-3/4

37

28

1-3/4

30

38-3/4

36

28

1-3/8

1

1-3/8

1

43

39-1/4

28

2*

32

41-3/4

38-1/2

28

    

1-5/8

1

45-1/4

41-1/2

28

2

33

                      

34

43-3/4

40-1/2

32

    

1-5/8

1

47-1/2

43-1/2

28

2

35

                      

36

46

42-3/4

32

1-5/8

1

1-5/8

1

50

46

32

2-1/4*

38

48-3/4

45-1/4

32

    

1-5/8

1

56

43

32

1-5/8

40

50-3/4

47-1/4

36

1-5/8

1-1/8

1-5/8

1

48-3/4

45-1/2

32

1-3/4

42

53

49-1/2

36

    

1-5/8

1-1/8

57*

52-3/4*

36*

2-1/4*

44

55-1/4

51-3/4

40

    

1-5/8

1-1/8

53-1/4

49-3/4

32

1-5/8

46

57-1/4

53-3/4

40

    

1-5/8

1-1/8

55-3/4

52

28

2

48

59-1/2

56

44

1-5/8

1-1/8

1-5/8

1-1/8

65*

60-3/4*

40*

2-1/4*
Specifications: 25/125/150 LB. DRILLING AWWA C207-78 Specifications: 250/300 LB. DRILLING
ANSI B16.1-1975 Class 25 –   2 Tbl 1 & 2, Class D, Tbl 3, Class E – 3 ANSI B16.1-1975 Class 250
ANSI B15.1-1975 Class 125 – 1 AWW C207-78 Tbl 1 & 2, Class B – 4 ANSI B16.24-1971 300 lb.
ANSI B16.24-1971 –              1 MSS SP-44 1975 Class 150 –         1 ANSI B16.5-1973 Class 300
ANSI B16.5 Class 125/150 –  3 SS SP-51 1965 MSS 150# –           1 MSS SP-44-1975 Class 300

NOMINAL

PN10

PN16

PN25
 

O.D.

B.C. DIA.

NO. B.H.

B.H. DIA.

O.D.

B.C. DIA.

NO. B.H.

B.H. DIA.

O.D.

B.C. DIA.

NO. B.H.

B.H. DIA.

DN 25

4.53

3.35

4

0.55

4.53

3.35

4

0.55

4.53

3.35

4

0.55

DN 32

5.51

3.94

4

0.71

5.51

3.94

4

0.71

5.51

3.94

4

0.71

DN 40

5.91

4.33

4

0.71

5.91

4.33

4

0.71

5.91

4.33

4

0.71

DN 50

6.5

4.92

4

0.71

6.5

4.92

4

0.71

6.5

4.92

4

0.71

DN 65

7.28

5.71

8

0.71

7.28

5.71

8

0.71

7.28

5.71

8

0.71

DN 80

7.87

6.3

8

0.71

7.87

6.3

8

0.71

7.87

6.3

8

0.71

DN 100

8.66

7.09

8

0.71

8.66

7.09

8

0.71

9.25

7.48

8

0.87

DN 125

9.84

9.84

8

0.71

9.84

9.84

8

0.71

10.63

10.63

8

1.02

DN 150

11.22

9.45

8

0.87

11.22

9.45

8

0.87

11.81

9.84

8

1.02

DN 175

12.4

10.63

8

0.87

12.4

10.63

8

0.87

12.99

11.02

12

1.02

DN 200

13.39

11.61

8

0.87

13.39

11.61

12

0.87

14.17

12.2

12

1.02

DN 250

15.55

13.78

12

0.87

15.94

13.98

12

1.02

16.73

14.57

12

1.18

DN 300

17.52

15.75

12

0.87

18.11

16.14

12

1.02

19.09

16.93

16

1.18

DN 350

19.88

18.11

16

0.87

20.47

18.5

16

1.02

21.85

19.29

16

1.3

DN 400

22.24

20.28

16

1.02

22.83

20.67

16

1.18

24.41

21.65

16

1.42

DN 500

26.38

24.41

20

1.02

28.15

25.59

20

1.3

28.74

25.98

20

1.42

DN 600

30.71

28.54

20

1.06

33.07

30.31

20

1.3

33.27

30.31

20

1.42
-->