ANSI B16.5 Class 300 Blind Flanges Raised Face Diameter 1.38-27.25in

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Raised Face Diameter (R)

Approximate Weight (lbs)

Bolt Circle (C)

Number of Holes

Diameter of Holes

 1/2

3.75

0.56

1.38

2

2.63

4

0.63

 3/4

4.63

0.63

1.69

3

3.25

4

0.75

1

4.88

0.69

2

3

3.5

4

0.75

1 1/4

5.25

0.75

2.5

4

3.88

4

0.75

1 1/2

6.13

0.81

2.88

6

4.5

4

0.88

2

6.5

0.88

3.63

8

5

8

0.75

2 1/2

7.5

1

4.13

12

5.88

8

0.88

3

8.25

1.13

5

16

6.63

8

0.88

3 1/2

9

1.19

5.5

21

7.25

8

0.88

4

10

1.25

6.19

27

7.88

8

0.88

5

11

1.38

7.31

35

9.25

8

0.88

6

12.5

1.44

8.5

50

10.63

12

0.88

8

15

1.63

10.63

81

13

12

1

10

17.5

1.88

12.75

124

15.25

16

1.13

12

20.5

2

15

185

17.75

16

1.25

14

23

2.13

16.25

250

20.25

20

1.25

16

25.5

2.25

18.5

295

22.5

20

1.38

18

28

2.38

21

395

24.75

24

1.38

20

30.5

2.5

23

505

27

24

1.38

22

33

2.63

25.25

640

29.25

24

1.63

24

36

2.75

27.25

790

32

24

1.63