宽度ln.

厚   度in.

3/16

1/4

5/16

3/8

7/16

1/2

9/16

5/8

11/16

3/4

13/16

7/8

15/16

1

1/4

0.16

0.21

0.27

0.32

0.37

0.43

0.48

0.53

0.58

0.64

0.69

0.74

0.80

0.85

1/2

0.32

0.43

0.53

0.64

0.74

0.85

0.96

1.06

1.17

1.28

1.38

1.49

1.60

1.70

3/4

0.48

0.64

0.80

0.96

1.12

1.28

1.44

1.60

1.75

1.91

2.07

2.23

2.39

2.55

1

0.64

0.85

1.06

1.28

1.49

1.70

1.91

2.13

2.34

2.55

2.76

2.98

3.19

3.40

11/4

 0.80

1.06

1.33

1.60

1.86

2.13

2.39

2.66

2.92

3.19

3.46

3.72

3.99

4.25

11/2

 0.96

1.28

1.60

1.91

2.23

2.55

2.87

3.19

3.51

3.83

4.15

4.47

4.79

5.10

13/4

1.12

1.49

1.86

2.23

2.61

2.98

3.35

3.72

4.09

4.47

4.84

5.21

5.58

5.95

2

1.28

1.70

2.13

2.55

2.98

3.40

3.83

4.25

4.68

5.10

5.53

5.95

6.38

6.81

21/4

1.44

1.91

2.39

2.87

3.35

3.83

4.31

4.79

5.26

5.74

6.22

6.70

7.18

7.66

21/2

1.60

2.13

2.66

3.19

3.72

4.25

4.79

5.32

5.85

6.38

6.91

7.44

7.98

8.51

23/4

1.75

2.34

2.92

3.51

4.09

4.68

5.26

5.85

6.43

7.02

7.60

8.19

8.77

9.36

3

1.91

2.55

3.19

3.83

4.47

5.10

5.74

6.38

7.02

7.66

8.29

8.93

9.57

10.2

31/4

2.07

2.76

3.46

4.15

4.84

5.53

6.22

6.91

7.60

8.29

8.99

9.68

10.4

11.1

31/2

2.23

2.98

3.72

4.47

5.21

5.95

6.70

7.11

8.19

8.93

9.68

10.4

11.2

11.9

33/4

2.39

3.19

3.99

4.79

5.58

6.38

7.18

7.98

8.77

9.57

10.4

11.2

12.0

12.8

4

2.55

3.40

4.25

5.10

5.95

6.81

7.66

8.51

9.36

10.2

11.1

11.9

12.8

13.6

41/4

2.71

3.62

4.52

5.42

6.33

7.23

8.13

9.04

9.94

10.8

11.8

12.7

13.6

14.5

41/2

2.87

3.83

4.79

5.74

6.70

7.66

8.61

9.57

10.5

11.5

12.4

13.4

14.4

15.3

43/4

3.03

4.04

5.05

6.06

7.07

8.08

9.09

10.1

11.1

12.1

13.1

14.1

15.2

16.2

5

3.19

4.25

5.32

6.38

7.44

8.51

9.57

10.6

11.7

12.8

13.8

14.9

16.0

17.0

51/4

3.35

4.47

5.58

6.70

7.82

8.93

10.0

11.2

12.3

13.4

14.5

15.6

16.7

17.9

51/2

3.51

4.68

5.85

7.02

8.19

9.36

10.5

11.7

12.9

14.0

15.2

16.4

17.5

18.7

53/4

3.67

4.89

6.11

7.34

8.56

9.78

11.0

12.2

13.5

14.7

15.9

17.1

18.3

19.6

6

3.83

5.10

6.38

7.66

8.93

10.2

11.5

12.8

14.0

15.3

16.6

17.9

19.1

20.4

61/4

3.99

5.32

6.65

7.98

9.30

10.6

12.0

13.3

14.6

16.0

17.3

18.6

19.9

21.3

61/2

4.15

5.53

6.91

8.29

9.68

11.1

12.4

13.8

15.2

16.6

18.0

19.4

20.7

22.1

63/4

4.31

5.74

7.18

8.61

10.0

11.5

12.9

14.4

15.8

17.2

18.7

20.1

21.5

23.0

7

4.47

5.95

7.44

8.93

10.4

11.9

13.4

14.9

16.4

17.9

19.4

20.8

22.3

23.8

71/4

4.63

6.17

7.71

9.25

10.8

12.3

13.9

15.4

17.0

18.5

20.0

21.6

23.1

24.7

71/2

4.79

6.38

7.98

9.57

11.2

12.8

14.4

16.0

17.5

19.1

20.7

22.3

23.9

25.5

73/4

4.94

6.59

8.24

9.89

11.5

13.2

14.8

16.5

18.1

19.8

21.4

23.1

24.7

26.4

8

5.10

6.81

8.51

10.2

11.9

13.6

15.3

17.0

18.7

20.4

22.1

23.8

25.5

27.2

81/2

5.42

7.23

9.04

10.8

12.7

14.5

16.3

18.1

19.9

21.7

23.5

25.3

27.1

28.9

9

5.74

7.66

9.57

11.5

13.4

15.3

17.2

19.1

21.1

23.0

24.9

26.8

28.7

30.6

91/2

6.06

8.08

10.1

12.1

14.1

16.2

18.2

20.2

22.2

24.2

26.3

28.3

30.3

32.3

10

6.38

8.51

10.6

12.8

14.9

17.0

19.1

21.3

23.4

25.5

27.6

29.8

31.9

34.0

101/2

6.70

8.93

11.2

13.4

15.6

17.9

20.1

22.3

24.6

26.8

29.0

31.3

33.5

35.7

11

7.02

9.36

11.7

14.0

16.4

18.7

21.1

23.4

25.7

28.1

30.4

32.8

35.1

37.4

111/2

7.34

9.78

12.2

14.7

17.1

19.6

22.0

24.5

26.9

29.3

21.8

34.2

36.7

39.1

12

7.66

10.2

12.8

15.3

17.9

20.4

23.0

25.5

28.1

30.6

33.2

35.7

38.3

40.8