直径d

(或边长a)

／mm

精度组别

截面面积／cm²

理论质量(kg／m)

1组

2组

3组

圆  钢

方  钢

圆 钢

方  钢

允许偏差／mm

5.5

±0.20

±0.30

±0.40

..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

*11

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

1.21

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

±. 30

±. 40

±. 50

3.464

4.41

2.72

3.46

22

3.801

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

5.31

*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

9.61

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

9.621

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

±. 70

±0.80

22.06

28.09

17.3

22..

*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

±. 60

±. 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..

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

±. 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

121

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

-

-

±2.5

314.16

400.00

247

314

220

380.13

-

298

-

250

490.88

-

385

-

对边距离

s／mm

允许偏差／mm

截面面积／cm2

理论质量(kg／m)

1组

2组

3组

六角钢

八角钢

六角钢

八角钢

8

±0.25

±0.35

±0.40

0.5543

0.435

9

0.7015

0.551

10

0.866

0.680

11

1.048

0.823

12

1.247

0.979

13

1.464

1.15

14

1.697

1.33

15

1.949

1.53

16

2.217

2.120

1.74

1.66

17

2.503

1.96

18

2.806

2.683

2.20

2.16