ANSI B16.5 Class 300 Lap Joint Flanges Length Thru Hub 0.88-5.75 in

Nominal Pipe Size

Outside Diameter (O)

Thickness (T)

Length Thru Hub (Y)

Hub Diameter (X)

Radius (r)

Bore (B)

Approximate Weight (lbs)

Bolt Circle (C)

Number of Holes

Diameter of Holes

 1/2

3.75

0.56

0.88

1.5

0.13

0.9

2

2.63

4

0.63

 3/4

4.63

0.63

1

1.88

0.13

1.11

3

3.25

4

0.75

1

4.88

0.69

1.06

2.13

0.13

1.38

3

3.5

4

0.75

1 1/4

5.25

0.75

1.06

2.5

0.19

1.72

4

3.88

4

0.75

1 1/2

6.13

0.81

1.19

2.75

0.25

1.97

6

4.5

4

0.88

2

6.5

0.88

1.31

3.31

0.31

2.46

7

5

8

0.75

2 1/2

7.5

1

1.5

3.94

0.31

2.97

10

5.88

8

0.88

3

8.25

1.13

1.69

4.63

0.38

3.6

13

6.63

8

0.88

3 1/2

9

1.19

1.75

5.25

0.38

4.1

17

7.25

8

0.88

4

10

1.25

1.88

5.75

0.44

4.6

22

7.88

8

0.88

5

11

1.38

2

7

0.44

5.69

28

9.25

8

0.88

6

12.5

1.44

2.06

8.13

0.5

6.75

39

10.63

12

0.88

8

15

1.63

2.44

10.25

0.5

8.75

58

13

12

1

10

17.5

1.88

3.75

12.63

0.5

10.92

91

15.25

16

1.13

12

20.5

2

4

14.75

0.5

12.92

140

17.75

16

1.25

14

23

2.13

4.38

16.75

0.5

14.18

190

20.25

20

1.25

16

25.5

2.25

4.75

19

0.5

16.19

250

22.5

20

1.38

18

28

2.38

5.13

21

0.5

18.2

295

24.75

24

1.38

20

30.5

2.5

5.5

23.13

0.5

20.25

370

27

24

1.38

22

33

2.63

5.75

25.25

0.5

22.25

435

29.25

24

1.63