ANSI Flange Dimension Chart

300# ANSI Blind Flanges

DISCLAIMER

 

Nominal
Pipe
Size

"A"
(O.D.)

"B"
(Thk.)

"C"
(RF Dia.)

"D"
(B.C.D.)

# Bolt
Holes

Dia. of
Bolt Holes

Approx.
Weight

 1/2"

3-3/4

9/16

1-3/8

2-5/8

4

5/8

2

 3/4"

4-5/8

5/8

1-11/16

3-1/4

4

3/4

3

 1"

4-7/8

11/16

2

3-1/2

4

3/4

4

 1-1/4"

5-1/4

3/4

2-1/2

3-7/8

4

3/4

6

 1-1/2"

6-1/8

13/16

2-7/8

4-1/2

4

7/8

7

 2"

6-1/2

7/8

3-5/8

5

8

3/4

8

 2-1/2"

7-1/2

1

4-1/8

5-7/8

8

7/8

12

 3"

8-1/4

1-1/8

5

6-5/8

8

7/8

16

 3-1/2"

9

1-3/16

5-1/2

7-1/4

8

7/8

21

 4"

10

1-1/4

6-3/16

7-7/8

8

7/8

28

 5"

11

1-3/8

7-5/16

9-1/4

8

7/8

37

 6"

12-1/2

1-7/16

8-1/2

10-5/8

12

7/8

48

 8"

15

1-5/8

10-5/8

13

12

1

79

 10"

17-1/2

1-7/8

12-3/4

15-1/4

16

1-1/8

122

 12"

20-1/2

2

15

17-3/4

16

1-1/4

183

 14"

23

2-1/8

16-1/4

20-1/4

20

1-1/4

241

 16"

25-1/2

2-1/4

18-1/2

22-1/2

20

1-3/8

315

 18"

28

2-3/8

21

24-3/4

24

1-3/8

414

 20"

30-1/2

2-1/2

23

27

24

1-3/8

515

 24"

36

2-3/4

27-1/4

32

24

1-5/8

800

1/16" raised face included in flange thickness.