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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