ANSI B16.36 Flange

Nominal
Pipe Size

O.D.
Flange

Thk. Of
Flange
Min

Diam.
of
Raised
face

Diam.
of
Hub

Hub
Diam.
Chamfer
of W.N.

NPS

O

C

R

X

A

Y

in

1

4.88

1.5

2

2.12

1.32

3.25

1/4

3.5

0.69

0.75

4

5/8

R16

2

0.25

0.344

0.03

1

mm

25

124

38.1

50.8

53.8

33.5

82.6

6.4

88.9

17.5

19.1

15.9

50.8

6.35

8.738

0.8

25.4

in

1 1/2

6.12

1.5

2.88

2.75

1.9

3.38

1/4

4.5

0.81

0.88

4

3/4

R20

2.688

0.25

0.344

0.03

1

mm

40

155.4

38.1

73.2

69.9

48.3

85.9

6.4

114.3

20.6

22.4

19.1

68.275

6.35

8.738

0.8

25.4

in

2

6.5

1.5

3.62

3.31

2.38

3.38

1/4

5

0.69

0.75

8

5/8

R23

3.25

0.312

0.469

0.03

1.06

mm

50

165.1

38.1

91.9

84.1

60.5

85.9

6.4

127

17.5

19.1

15.9

82.55

7.925

11.913

0.8

26.9

in

2 1/2

7.5

1.5

4.12

3.94

2.88

3.5

1/4

5.88

0.81

0.88

8

3/4

R26

4

0.312

0.469

0.03

1.06

mm

65

190.5

38.1

104.6

100.1

73.2

88.9

6.4

149.4

20.6

22.4

19.1

101.6

7.925

11.913

0.8

26.9

in

3

8.25

1.5

5

4.62

3.5

3.5

3/8

6.62

0.81

0.88

8

3/4

R31

4.875

0.312

0.469

0.03

1.06

mm

80

209.6

38.1

127

117.3

88.9

88.9

9.5

168.2

20.6

22.4

19.1

123.83

7.925

11.913

0.8

26.9

in

4

10.75

1.5

6.19

6

4.5

4

1/2

8.5

1

1

8

7/8

R37

5.875

0.312

0.469

0.03

1.06

mm

100

273.1

38.1

157.2

152.4

114.3

101.6

12.7

215.9

25.4

25.4

22.2

149.23

7.925

11.913

0.8

26.9

in

6

14

1.88

8.5

8.75

6.63

4.62

1/2

11.5

1.12

1.12

12

1

R45

8.312

0.312

0.469

0.03

1.06

mm

150

355.6

47.8

215.9

222.3

168.4

117

12.7

292.1

28.4

28.4

25.4

211.13

7.925

11.913

0.8

26.9

in

8

16.5

2.19

10.62

10.75

8.63

5.25

1/2

13.75

1.25

1.25

12

1 1/8

R49

10.625

0.312

0.469

0.03

1.06

mm

200

419.1

55.6

269.7

273.1

219.2

133

12.7

349.3

31.8

31.8

28.6

269.88

7.925

11.913

0.8

26.9

in

10

20

2.5

12.75

13.5

10.75

6

1/2

17

1.38

1.38

16

1 1/4

R53

12.75

0.312

0.469

0.03

1.06

mm

250

508

63.5

323.9

342.9

273.1

152

12.7

431.8

35.1

35.1

31.8

323.85

7.925

11.913

0.8

26.9

in

12

22

2.62

15

15.75

12.75

6.12

1/2

19.25

1.38

1.38

20

1 1/4

R57

15

0.312

0.469

0.03

1.06

mm

300

558.8

66.5

381

400.1

323.9

155.4

12.7

489

35.1

35.1

31.8

381

7.925

11.913

0.8

26.9

in

14

23.75

2.75

16.25

17

14

6.5

1/2

20.75

1.5

1.5

20

1 3/8

R61

16.5

0.312

0.469

0.03

1.06

mm

350

603.3

69.9

412.8

431.8

355.6

165

12.7

527.1

38.1

38.1

35.1

419.1

7.925

11.913

0.8

26.9

in

16

27

3

18.5

19.5

16

7

1/2

23.75

1.6

1.6

20

1 1/2

R65

18.5

0.312

0.469

0.03

1.19

mm

400

685.8

76.2

469.9

495.3

406.4

178

12.7

603.3

41.1

41.1

38.1

469.9

7.925

11.913

0.8

30.2

in

18

29.25

3.25

21

21.5

18

7.25

1/2

25.75

1.75

1.75

20

1 5/8

R69

21

0.312

0.469

0.03

1.19

mm

450

743

82.6

533.4

546.1

457.2

184

12.7

654.1

44.5

44.5

41.3

533.4

7.925

11.913

0.8

30.2

in

20

32

3.5

23

24

20

7.5

1/2

28.5

1.75

1.75

24

1 5/8

R73

23

0.375

0.531

0.06

1.25

mm

500

812.8

88.9

584.2

609.6

508

191

12.7

723.9

44.5

44.5

41.3

584.2

9.525

13.487

1.5

31.8

in

24

37

4

27.25

28.25

24

8

1/2

33

2

2

24

1 7/8

mm

600

939.8

101.6

692.2

717.6

609.6

203

12.7

838.2

50.8

50.8

47.6