ASME B16.5 Flange Chart | Southern Fasteners & Supply

ORLANDO LOCATION CLOSED due to Hurricane Milton—Wednesday and Thursday this week.

Flanges are standardized according publications from organizations like ASME, MSS, API and others. Dimensions are determined by the pipe size and the pressure class required for the application, and range from ½” to 24”; in classes ranging from 150 to 2500.

150

Nominal Pipe Size

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

3 1/2

4

5

6

8

10

12

14

16

18

20

24

Number of Studs

4

8

12

16

20

Diameter of Studs

1/2

5/8

3/4

7/8

1

1 1/8

1 1/4

Length of Stud Bolts

1/16 Ring Flange

2 1/4

2 1/2

2 3/4

3 1/4

3 1/2

3 3/4

4

4 1/4

4 1/2

4 3/4

5 1/4

5 3/4

6 1/4

6 3/4

Ring Type Joint

3

3 1/4

3 3/4

4

4 1/4

4 1/2

4 3/4

5

5 1/4

5 3/4

6 1/4

6 3/4

7 1/4

Length of Machine Bolt

1/16 Ring Flange

2

2 1/4

2 1/2

2 3/4

3

3 1/4

3 1/2

4

4 1/2

5

5 1/2

6

Ring No.

R15

R17

R19

R22

R25

R29

R33

R36

R40

R43

R48

R52

R56

R59

R64

R68

R72

R76

300

Nominal Pipe Size

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

3 1/2

4

5

6

8

10

12

14

16

18

20

24

Number of Studs

4

8

12

16

20

24

Diameter of Studs

1/2

5/8

3/4

5/8

3/4

7/8

1

1 1/8

1 1/4

1 1/2

Length of Stud Bolts

1/16 Ring Flange

2 1/2

3

3 1/4

3 1/2

4

4 1/4

4 1/2

4 3/4

5 1/2

6 1/4

6 3/4

7

7 1/2

7 3/4

8

9

Ring Type Joint

3

3 1/2

3 3/4

4

4 1/2

4 3/4

5

5 1/4

5 1/2

6

6 3/4

7 1/4

7 1/2

8

8 1/4

8 3/4

10

Length of Machine Bolt

1/16 Ring Flange

2 1/4

2 1/2

2 3/4

3

3 1/4

3 1/2

3 3/4

4 1/4

4 3/4

5 1/2

5 3/4

6 1/4

6 1/2

6 3/4

7 1/4

8

Ring No.

R11

R13

R16

R18

R20

R23

R26

R31

R34

R37

R41

R45

R49

R53

R57

R61

R65

R69

R73

R77

400

Nominal Pipe Size

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

3 1/2

4

5

6

8

10

12

14

16

18

20

24

Number of Studs

4

8

12

16

20

24

Diameter of Studs

1/2

5/8

3/4

5/8

3/4

7/8

1

1 1/8

1 1/4

1 3/8

1 1/2

1 3/4

Length of Stud Bolts

1/4 Ring Flange

3

3 1/2

3 3/4

4 1/4

4 3/4

5

5 1/2

5 3/4

6

6 3/4

7 1/2

8

8 1/4

8 3/4

9

9 1/2

10 1/2

Male & Female

2 3/4

3 1/4

3 1/2

4

4 1/2

4 3/4

5 1/4

5 3/4

6 1/2

7 1/4

7 3/4

8

8 1/2

8 3/4

9 1/4

10 1/4

Length of Machine Bolt

Ring Type Joint

3

3 1/2

3 3/4

4 1/4

4 3/4

5

5 1/2

5 3/4

6

6 3/4

7 1/2

8

8 1/4

8 3/4

9

9 3/4

11

Ring No.

R11

R13

R16

R18

R20

R23

R26

R31

R34

R37

R41

R45

R49

R53

R57

R61

R65

R69

R73

R77

600

Nominal Pipe Size

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

3 1/2

4

5

6

8

10

12

14

16

18

20

24

Number of Studs

4

8

12

16

20

24

Diameter of Studs

1/2

5/8

3/4

5/8

3/4

7/8

1

1 1/8

1 1/4

1 3/8

1 1/2

1 5/8

1 7/8

Length of Stud Bolts

1/4 Ring Flange

3

3 1/2

3 3/4

4 1/4

4 3/4

5

5 1/2

5 3/4

6 1/2

6 3/4

7 1/2

8 1/2

8 3/4

9 1/4

10

10 3/4

11 1/4

13

Male & Female

2 3/4

3 1/4

3 1/2

4

4 1/2

4 3/4

5 1/4

5 1/2

6 1/4

6 1/2

7 1/4

8 1/4

8 1/2

9

9 3/4

10 1/2

11

12 3/4

Length of Machine Bolt

Ring Type Joint

3

3 1/2

3 3/4

4 1/4

4 3/4

5

5 1/2

5 3/4

6 1/2

6 3/4

7 3/4

8 1/2

8 3/4

9 1/4

10

10 3/4

11 1/2

13 1/4

Ring No.

R11

R13

R16

R18

R20

R23

R26

R31

R34

R37

R41

R45

R49

R53

R57

R61

R65

R69

R73

R77

900

Nominal Pipe Size

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

3 1/2

4

5

6

8

10

12

14

16

18

20

24

Number of Studs

4

8

12

16

20

Diameter of Studs

3/4

7/8

1

7/8

1

7/8

1 1/8

1 1/4

1 1/8

1 3/8

1 1/2

1 5/8

1 7/8

2

2 1/2

Length of Stud Bolts

1/4 Ring Flange

4 1/4

4 1/2

5

5 1/2

5 3/4

6 1/4

5 3/4

6 3/4

7 1/2

8 3/4

9 1/4

10

10 3/4

11 1/4

12 3/4

13 3/4

17 1/4

Male & Female

4

4 1/4

4 3/4

5 1/4

5 1/2

6

5 1/2

6 1/2

7 1/4

8 1/2

9

9 3/4

10 1/2

11

12 1/2

13 1/2

17

Length of Machine Bolt

Ring Type Joint

4 1/4

4 1/2

5

5 1/2

5 3/4

6 1/4

5 3/4

6 3/4

7 1/2

7 3/4

8 3/4

9 1/4

10

11

11 1/2

13 1/4

14 1/4

18

Ring No.

R12

R14

R16

R18

R20

R24

R27

R31

R37

R41

R45

R49

R53

R57

R62

R66

R70

R74

R78

1500

Nominal Pipe Size

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

3 1/2

4

5

6

8

10

12

14

16

18

20

24

Number of Studs

4

8

12

16

Diameter of Studs

3/4

7/8

1

7/8

1

1 1/8

1 1/4

1 1/2

1 3/8

1 5/8

1 7/8

2

2 1/4

2 1/2

2 3/4

3

3 1/2

Length of Stud Bolts

1/4 Ring Flange

4 1/4

4 1/2

5

5 1/2

5 3/4

6 1/4

7

7 3/4

9 3/4

10 1/4

11 1/2

13 1/4

14 3/4

16

17 1/2

19 1/2

21 1/4

24 1/4

Male & Female

4

4 1/4

4 3/4

5 1/4

5 1/2

6

6 3/4

7 1/2

9 1/2

10

11 1/4

13

14 1/2

15 3/4

17 1/4

19 1/4

21

24

Length of Machine Bolt

Ring Type Joint

4 1/4

4 1/2

5

5 1/2

5 3/4

6 1/4

7

7 3/4

9 3/4

10 1/2

12 3/4

13 1/2

15 1/4

16 3/4

18 1/2

20 3/4

22 1/4

25 1/2

Ring No.

R12

R14

R16

R18

R20

R24

R27

R35

R39

R44

R46

R50

R54

R58

R63

R67

R71

R75

R79

2500

Nominal Pipe Size

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

3 1/2

4

5

6

8

10

12

Number of Studs

4

8

12

Diameter of Studs

3/4

7/8

1

1 1/8

1

1 1/8

1 1/4

1 1/2

1 3/4

2

2 1/2

2 3/4

Length of Stud Bolts

1/4 Ring Flange

4 3/4

5

5 1/2

6

6 3/4

7

7 3/4

8 3/4

10

11 3/4

13 1/2

15

19 1/4

21 1/4

Male & Female

4 1/2

4 3/4

5 1/4

5 3/4

6 1/2

6 3/4

7 1/2

8 1/2

9 3/4

11 1/2

13 1/4

14 3/4

19

21

Length of Machine Bolt

Ring Type Joint

4 3/4

5

5 1/2

6

6 3/4

7

8

9

10 1/4

12 1/4

14

15 1/2

20

22

Ring No.

R13

R16

R18

R21

R23

R26

R28

R32

R38

R42

R47

R51

R55

R60