Metric Size

Diameter mm

Area mm 2

Weight Factors
kg/m   kg/ft

Imperial Size

Diameter Inches

Area in 2

Weight Factors
lb/ft   lb/m

10

9.5

71

0.560

0.171

3

.375

.11

.376

1.234

13

12.7

129

0.994

0.303

4

.500

.20

.668

2.192

16

15.9

199

1.552

0.473

5

.625

.31

1.043

3.422

19

19.1

284

2.235

0.681

6

.750

.44

1.502

4.928

22

22.2

387

3.042

0.927

7

.875

.60

2.044

6.706

25

25.4

510

3.973

1.211

8

1.000

.79

2.67

8.76

29

28.7

645

5.060

1.542

9

1.128

1.00

3.4

11.155

32

32.3

819

6.404

1.952

10

1.270

1.27

4.303

14.117

36

35.8

1006

7.907

2.41

11

1.410

1.56

5.313

17.431

43

43.0

1452

11.384

3.47

14

1.693

2.25

7.65

25.098

57

57.3

2581

20.239

6.169

18

2.257

4.00

13.6

44.619

Comparison of Steel Grades

Grade

Metric Mpa

Psi

Grade

Imperial Mpa

Psi

300

300

43,511

40

257.79

40,000

420

420

60,916

60

413.69

60,000

520

520

75,420

75

517.11

75,000