Nominal Bore

Outside Diameter

Light (A-Class) Thickness Weight

Medium (B-Class) Thickness Weight

Heavy (C-Class) Thickness Weight

Inch

mm

Inch

mm

mm

kg/mtr

mm

kg/mtr

mm

kg/mtr

1/8″

3 mm

0.406

10.32

1.80

0.361

2.00

2.65

0.493

1/4″

6 mm

0.532

13.49

1.80

0.517

2.35

0.407

2.90

0.769

3/8″

10 mm

0.872

17.10

1.80

0.674

2.35

0.852

2.90

1.02

1/2″

15 mm

0.844

21.43

2.00

0.952

2.65

1.122

3.25

1.45

3/4″

20 mm

1.094

27.20

2.35

1.410

2.65

1.580

3.25

1.90

1″

25 mm

1.312

33.80

2.65

2.010

3.25

2.440

4.05

2.97

1.1/4″

32 mm

1.656

42.90

2.65

2.580

3.25

3.140

4.05

3.84

1.1/2″

40 mm

1.906

48.40

2.90

3.250

3.25

3.610

4.05

4.43

2″

50 mm

2.375

60.30

2.90

4.110

3.65

5.100

4.47

6.17

2.1/2″

65 mm

3.004

76.20

3.25

5.840

3.65

6.610

4.47

7.90

3″

80 mm

3.500

88.90

3.25

6.810

4.05

8.470

4.85

10.1

4″

100 mm

4.500

114.30

3.65

9.890

4.50

12.10

5.40

14.4

5″

125 mm

5.500

139.70

–

–

4.85

16.20

5.40

17.8

6″

150 mm

6.500

165.10

–

–

4.85

19.20

5.40

21.2