ANSI B16.5 Class 400 Threaded Flanges Diameter of Holes 0.63-1.88 In

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Raised Face Diameter (R)

Length Thru Hub (Y)

Hub Diameter (X)

Approximate Weight (lbs)

Bolt Circle (C)

Number of Holes

Diameter of Holes

 1/2

3.75

0.56

1.38

0.88

1.5

2

2.63

4

0.63

 3/4

4.63

0.63

1.69

1

1.88

3

3.25

4

0.75

1

4.88

0.69

2

1.06

2.13

4

3.5

4

0.75

1 1/4

5.25

0.81

2.5

1.13

2.5

5

3.88

4

0.75

1 1/2

6.13

0.88

2.88

1.25

2.75

7

4.5

4

0.88

2

6.5

1

3.63

1.44

3.31

9

5

8

0.75

2 1/2

7.5

1.13

4.13

1.63

3.94

13

5.88

8

0.88

3

8.25

1.25

5

1.81

4.63

16

6.63

8

0.88

3 1/2

9

1.38

5.5

1.94

5.25

21

7.25

8

1

4

10

1.38

6.19

2

5.75

26

7.88

8

1

5

11

1.5

7.31

2.13

7

31

9.25

8

1

6

12.5

1.63

8.5

2.25

8.13

44

10.63

12

1

8

15

1.88

10.63

2.69

10.25

67

13

12

1.13

10

17.5

2.13

12.75

2.88

12.63

91

15.25

16

1.25

12

20.5

2.25

15

3.13

14.75

130

17.75

16

1.38

14

23

2.38

16.25

3.31

16.75

180

20.25

20

1.38

16

25.5

2.5

18.5

3.69

19

235

22.5

20

1.5

18

28

2.63

21

3.88

21

285

24.75

24

1.5

20

30.5

2.75

23

4

23.13

345

27

24

1.63

22

33

2.88

25.25

4.25

25.25

405

29.25

24

1.75

24

36

3

27.25

4.5

27.63

510

32

24

1.88