Material Hardness Tonnage Ratios


Material Description Tons/
sq. inches
Shear Strength/
sq. inches
Multiplier to
Nominal Mild Steel

Aluminum ­ Soft Sheet

7.5

15,000 psi

.3

Aluminum ­ Half Hard

9.5

19,000 psi

.38

Aluminum ­ Hard

12

25,000 psi

.5

Brass ­ Soft Sheet

15

30,000 psi

.6

Brass ­ Half Hard

17.5

35,000 psi

.7

Copper ­ Rolled

14

28,000 psi

.57

Steel ­ Mild

25

50,000 psi

1.00

Steel ­ ASTM A36

30

60,000 psi

1.20

Steel ­ 50 Carbon

35

70,000 psi

1.40

Steel ­ Cold Drawn

30

60,000 psi

1.20

Steel ­ Stainless (18-8)

35

70,000 psi

1.40

 
 
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