Nominal Size Inch.

Outside Diameter mm

Wall Thickness (mm)

Class 'B'

Class 'C'

Class 'D'

Class 'E'

Class 'O'

Class '6'

Class '7'

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

3/8

17.0

17.3

1.5

1.9

2.3

2.8

3.2

3.8

1/2

21.2

21.5

1.7

2.1

2.8

3.3

3.7

4.3

3/4

26.6

26.9

1.9

2.5

2.9

3.4

3.9

4.5

1

33.4

33.7

2.2

2.7

3.4

4.0

4.5

5.2

1 1/4

42.1

42.4

2.2

2.7

2.7

3.2

3.6

4.2

4.8

5.5

1 1/2

48.1

48.4

2.5

3.0

3.1

3.7

1.8

2.2

3.7

4.3

5.1

5.9

2

60.2

60.5

2.5

3.0

3.1

3.7

3.9

4.5

1.8

2.2

5.5

6.3

2 1/2

75.0

75.3

3.0

3.5

3.9

4.5

4.8

5.5

1.8

2.2

3

88.7

89.1

2.9

3.4

3.5

4.1

4.6

5.3

5.7

6.6

1.8

2.2

4

114.1

114.5

3.4

4.0

4.5

5.2

6.0

6.9

7.3

8.4

2.3

2.8

5

140.0

140.4

3.8

4.4

5.5

6.4

7.3

8.4

9.0

10.4

2.6

3.1

6

168.0

168.5

4.5

5.2

6.6

7.6

8.8

10.2

10.8

12.5

3.1

3.7

8

218.8

219.4

5.3

6.1

7.8

9.0

10.3

11.9

12.6

14.5

3.1

3.7