直徑d

(或邊長

a)／mm

精度組別

截面面積／cm²

理論質(zhì)量(kg／m)

1組

2組

3組

圓  鋼

方  鋼

圓 鋼

方  鋼

允許偏差／mm

5.5

士0.20

±0.30

士0.40

O．2375

0.30

0.186

0.237

6

0.2827

0.36

0.222

0.283

6.5

0.3318

0.42

0.260

0.332

7

0.3848

0.49

0.302

0.385

8

±0.25

±0.35

±0.40

0.5077

0.64

0.395

0.502

9

0.6362

0.81

0.499

0.636

10

0.7854

1.0

0.617

0.785

*1l

0.9503

1.21

0.746

0.95

12

1.131

1.44

0.888

1.13

13

1.327

1.69

1.04

1.33

14

1.539

1.96

1.2l

1.54

15

1.767

2.25

1.39

1.77

16

2.011

2.56

1.58

2.01

17

2.270

2.89

1.78

2.27

18

2.545

3.24

2.00

2.54

19

2.835

3.61

2.23

2.83

20

3.142

4.00

2.47

3.14

21

±O．30

±O．40

±O．50

3.464

4.41

2.72

3.46

22

3.80l

4.84

2.98

3.80

*23

4.155

5.29

3.26

4.15

24

4.524

5.76

3.55

4.52

25

4.909

6.25

3.85

4.91

26

5.309

6.76

4.17

5.3l

*27

5.726

7.29

4.49

5.72

28

6.158

7.84

4.83

6.15

*29

6.605

8.41

5.18

6.60

30

7.069

9.00

5.55

7.06

*31

±0.40

±0.50

±0.60

7.548

9.6l

5.93

7.54

32

8.042

10.24

6.31

8.04

*33

8.553

10.89

6.71

8.55

34

9.097

11.56

7.13

9.07

*35

9.62l

12.25

7.55

9.62

36

10.18

12.96

7.99

10.2

38

11.34

14.44

8.90

11．3

40

12.57

16.00

9.86

12.6

42

13.85

17.64

10.9

13.8

45

15.90

20.25

12.5

15.9

48

18.10

23.04

14.2

18.1

50

19.64

25．00

15.4

19.6

53

±0.60

士O．70

±0.80

22.06

28.09

17.3

22．O

*55

23.76

30.25

18.6

23.7

56

24.63

31.36

19.3

24.6

*58

26.42

33.64

20.7

26.4

60

±O．60

±O．70

±0.80

28.27

36.00

22.2

28.3

63

31.17

39.69

24.5

31.2

*65

33.18

42.25

26．O

33.2

*68

36.32

46.24

28.5

36.3

70

38.48

49.00

30.2

38.5

75

44.18

56.25

34.7

44.2

80

50.27

64.00

39.5

50.2

85

±O．9

±1.0

±1.1

56.75

72.25

44.5

56.7

90

63.62

81.00

49.9

63.6

95

70.88

90.25

55.6

70.8

100

78.54

100.00

61.7

78.5

105

86.59

110.25

68.0

86.5

110

95.03

121.00

74.6

95．0

115

±1.2

±1.3

±1.4

103.82

132.26

81.5

104

120

113.10

144.00

88.8

113

125

122.72

156.25

96.3

123

130

132.73

169.00

104

133

140

153.94

196.00

12l

154

150

176.72

225.00

139

177

160

-

-

±2.0

201.06

256.00

158

201

170

226.98

289.00

178

227

180

254.47

324.00

200

254

190

283.53

361.00

223

283

200

-

-

士2.5

314.16

400.00

247

314

220

380.13

-

298

-

250

490.88

-

385

-