ANSI B16.5 Class 300 Welding Neck Pipe Flanges, Thickness 0.56-2.75 in

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Raised Face Diameter (R)

Length Thru Hub (Y)

Point of Weld (A)

Hub Diameter (X)

Bore (B)

Approximate Weight (lbs)

Bolt Circle (C)

Number of Holes

Diameter of Holes

 1/2

3.75

0.56

1.38

2.06

0.84

1.5

0.62

2

2.63

4

0.63

 3/4

4.63

0.63

1.69

2.25

1.05

1.88

0.82

3

3.25

4

0.75

1

4.88

0.69

2

2.44

1.32

2.13

1.05

4

3.5

4

0.75

1 1/4

5.25

0.75

2.5

2.56

1.66

2.5

1.38

5

3.88

4

0.75

1 1/2

6.13

0.81

2.88

2.69

1.9

2.75

1.61

7

4.5

4

0.88

2

6.5

0.88

3.63

2.75

2.38

3.31

2.07

9

5

8

0.75

2 1/2

7.5

1

4.13

3

2.88

3.94

2.47

12

5.88

8

0.88

3

8.25

1.13

5

3.13

3.5

4.63

3.07

15

6.63

8

0.88

3 1/2

9

1.19

5.5

3.19

4

5.25

3.55

18

7.25

8

0.88

4

10

1.25

6.19

3.38

4.5

5.75

4.03

25

7.88

8

0.88

5

11

1.38

7.31

3.88

5.56

7

5.05

32

9.25

8

0.88

6

12.5

1.44

8.5

3.88

6.63

8.13

6.07

42

10.63

12

0.88

8

15

1.63

10.63

4.38

8.63

10.25

7.98

67

13

12

1

10

17.5

1.88

12.75

4.63

10.75

12.63

10.02

91

15.25

16

1.13

12

20.5

2

15

5.13

12.75

14.75

12

140

17.75

16

1.25

14

23

2.13

16.25

5.63

14

16.75

13.25

180

20.25

20

1.25

16

25.5

2.25

18.5

5.75

16

19

15.25

250

22.5

20

1.38

18

28

2.38

21

6.25

18

21

17.25

320

24.75

24

1.38

20

30.5

2.5

23

6.38

20

23.13

19.25

400

27

24

1.38

22

33

2.63

25.25

6.5

22

25.25

21.25

465

29.25

24

1.63

24

36

2.75

27.25

6.63

24

27.63

23.25

580

32

24

1.63