FLANGE DIMENSIONS & DRILLING TEMPLETS

Dimensions of Class 2500 Steel Flange Valves and Fittings

Nominal
Size

Inside Diam.

OD of
Flange

Raised
Face Diam.

Thickness
of Flange

Diam. Of
Bolt Circle

Diam. Of
Bolt Holes

No. of Bolt

Diam. of Bolt

Facing
Diam.

Pitch
Diam.

Ring
No.

Depth of
Groove

Width of
Groove

Groove
Fillet
Radius

d

D

g

T

C

h

K

P

E

F

r

inch

inch

inch

inch

inch

inch

inch

inch

inch

inch

inch

inch

inch

inch

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

1/2

0.44

5.25

1.39

1.19

3.50

0.88

4

3/4

2.56

1.688

R13

0.25

0.344

0.03

15

11

133

34.9

30.5

88.9

23

65.0

42.86

6.35

8.74

0.8

3/4

0.56

5.50

1.69

1.25

3.75

0.88

4

3/4

2.88

2.000

R16

0.25

0.344

0.03

20

14

140

42.9

32.0

95.2

23

73.0

50.80

6.35

8.74

0.8

1

0.75

6.25

2.00

1.38

4.25

1.00

4

7/8

3.25

2.375

R18

0.25

0.344

0.03

25

19

159

50.8

35.0

107.9

26

8.25

60.33

6.35

8.74

0.8

1 1/4

1.00

7.25

2.50

1.50

5.12

1.12

4

1

4.00

2.844

R21

0.312

0.469

0.03

32

25

184

63.5

38.5

130.2

29

102

72.23

7.92

11.91

0.8

1 1/2

1.12

8.00

2.88

1.75

5.75

1.25

4

1 1/8

4.50

3.250

R23

0.312

0.469

0.03

40

29

203

73.0

44.5

146.0

32

114

82.55

7.92

11.91

0.8

2

1.50

9.25

3.62

2.00

6.75

1.12

8

1

5.25

4.000

R26

0.312

0.469

0.03

50

38

235

92.1

51.0

171.4

29

133

101.60

7.92

11.91

0.8

2 1/2

1.88

10.50

4.12

2.25

7.75

1.25

8

1 1/8

5.88

4.375

R28

0.375

0.531

0.06

65

48

267

104.8

57.5

196.8

32

149

111.13

9.52

13.49

1.5

3

2.25

12.00

5.00

2.62

9.00

1.38

8

1 1/4

6.62

5.000

R32

.0.375

0.531

0.06

80

57

305

127.0

67.0

228.6

35

168

127.00

9.52

13.49

1.5

4

2.88

14.00

6.19

3.00

10.75

1.62

8

1 1/2

8.00

6.188

R38

0.438

0.656

0.06

100

73

356

157.2

76.5

273.0

42

203

157.16

11.13

16.66

1.5

5

3.62

16.50

7.31

3.62

12.75

1.88

8

1 3/4

9.50

7.500

R42

0.500

0.781

0.06

125

92

419

185.7

92.5

323.8

48

241

190.50

12.70

19.84

1.5

6

4.38

19.00

8.50

4.25

14.5

2.12

8

2

11.00

9.000

R47

0.500

0.781

0.06

150

111

483

215.9

108.0

368.3

54

279

228.60

12.70

19.84

1.5

8

5.75

21.75

10.62

5.00

17.25

2.12

12

2

13.38

11.000

R51

0.562

0.906

0.06

200

146

550

269.9

127.0

438.1

54

340

279.40

14.27

23.01

1.5

10

7.25

26.50

12.75

6.50

21.25

2.62

12

2 1/2

16.75

13.500

R55

0.688

1.188

0.09

250

184

675

323.8

165.5

539.7

67

425

342.90

17.48

30.18

2.4

12

8.62

30.00

15.00

7.25

24.38

2.88

12

2 3/4

19.50

16.000

R60

0.688

1.312

0.09

300

219

760

381.0

184.5

619.1

74

495

406.40

17.48

33.32

2.4