Internal
diameter
of steel tube
N.D

External diameter of steel tube

O.D

scope of application

DI

Length

L

The biggest expand in the distance
l

Theickness of shell

t

Use the presure

Bar

The minimum torsion
P

Weight

(kg)

15

21.7

21-23

57

33

0.8

25

20-50

0.21

20

27.2

26-28

57

33

0.8

25

20-50

0.24

25

34.0

33-35

57

33

0.8

25

20-50

0.26

32

42.7

42-44

57

33

1.0

25

60-120

0.29

40

48.6

47-49

57

33

1.0

25

60-120

0.32

50

60.5

58-61

80

46

1.0

25

80-150

0.70

65

76.3

75-78

80

46

1.0

25

80-150

0.73

80

89.1

88-92

107

65

1.2

16

100-180

1.4

100

114.3

113-117

107

65

1.2

16

100-180

1.6

125

139.8

138-142

116

71

1.5

16

100-180

2.5

150

165.2

163-167

116

71

1.5

16

180-250

2.9

200

216.3

213-219

155

80

2.0

12

180-250

6.2

250

267.4

265-270

155

80

2.0

12

180-250

7.2

300

318.5

316-321

155

80

2.0

10

250-500

8.5

350

355.5

353-358

155

80

2.5

10

250-500

10.2

400

406.4

403-408

155

75

2.5

8

350-600

11.3

450

457.2

455-461

155

75

2.5

8

350-600

12.1

500

508.0

505-512

155

75

2.5

8

450-800

13.2