ANSI B16.5 Class 300 Threaded Flanges Approximate Weight 2-475 Lbs

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

3

3.5

4

0.75

1 1/4

5.25

0.75

2.5

1.06

2.5

4

3.88

4

0.75

1 1/2

6.13

0.81

2.88

1.19

2.75

6

4.5

4

0.88

2

6.5

0.88

3.63

1.31

3.31

7

5

8

0.75

2 1/2

7.5

1

4.13

1.5

3.94

10

5.88

8

0.88

3

8.25

1.13

5

1.69

4.63

13

6.63

8

0.88

3 1/2

9

1.19

5.5

1.75

5.25

17

7.25

8

0.88

4

10

1.25

6.19

1.88

5.75

22

7.88

8

0.88

5

11

1.38

7.31

2

7

28

9.25

8

0.88

6

12.5

1.44

8.5

2.06

8.13

39

10.63

12

0.88

8

15

1.63

10.63

2.44

10.25

58

13

12

1

10

17.5

1.88

12.75

2.62

12.63

81

15.25

16

1.13

12

20.5

2

15

2.88

14.75

115

17.75

16

1.25

14

23

2.13

16.25

3

16.75

165

20.25

20

1.25

16

25.5

2.25

18.5

3.25

19

190

22.5

20

1.38

18

28

2.38

21

3.5

21

250

24.75

24

1.38

20

30.5

2.5

23

3.75

23.13

315

27

24

1.38

22

33

2.63

25.25

4

25.25

370

29.25

24

1.63

24

36

2.75

27.25

4.19

27.63

475

32

24

1.63