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尺  寸

特  性**

公稱*尺寸

壁厚

每英尺重量

截面積

X-X軸

Y-Y軸

Ix

Sx

rx

Iy

Sy

ry

ln.

ln.

Lb.

ln.2

ln.4

ln.3

ln.

ln.4

ln.3

ln.

20×12

.5000

1/2

103.30

30.4

1650

165

7.37

750

125.0

4.97

.3750

3/8

78.52

23.1

1280

128

7.44

583

97.2

5.03

.3125

5/16

65.87

19.4

1080

108

7.47

495

82.5

5.06

20×8

.5000

1/2

89.68

26.4

1270

127

6.94

300

75.1

3.38

.3750

3/8

68.31

20.1

988

98.8

7.02

236

59.1

3.43

.3125

5/16

57.36

16.9

838

83.8

7.05

202

50.4

3.46

20×4

.5000

1/2

76.07

22.4

889

88.9

6.31

61.6

30.8

1.66

.3750

3/8

58.10

17.1

699

69.9

6.40

50.3

25.1

1.72

.3125

5/16

48.86

14.4

596

59.6

6.44

43.7

21.8

1.74

18×6

.5000

1/2

76.07

22.4

818

90.9

6.05

141

47.2

2.52

.3750

3/8

58.10

17.1

641

71.3

6.13

113

37.6

2.57

.3125

5/16

48.86

14.4

546

60.7

6.17

97.0

32.3

2.60

16×12

.5000

1/2

89.68

26.4

962

120

6.04

618

103.0

4.84

.3750

3/8

68.31

20.1

748

93.5

6.11

482

80.3

4.90

.3125

5/16

57.36

16.9

635

79.4

6.14

409

68.2

4.93

16×8

.5000

1/2

76.07

22.4

722

90.2

5.68

244

61.0

3.30

.3750

3/8

58.10

17.1

565

70.6

5.75

193

48.2

3.36

.3125

5/16

48.86

14.4

481

60.1

5.79

165

41.2

3.39

16×4

.5000

1/2

62.46

18.4

481

60.2

5.12

49.3

24.6

1.64

.3750

3/8

47.90

14.1

382

47.8

5.21

40.4

20.2

1.69

.3125

5/16

40.35

11.9

327

40.9

5.25

35.1

17.6

1.72

14×10

.5000

1/2

76.07

22.4

608

86.9

5.22

361

72.3

4.02

.3750

3/8

58.10

17.1

476

68.0

5.28

284

56.8

4.08

.3125

5/16

48.86

14.4

405

57.9

5.31

242

48.4

4.11