SAE Bolt StrengthTable:

SAE Bolt Strength

GRADE 2

GRADE 5

GRADE 8

Bolt Dia(in)

Coarse

Fine

Coarse

Fine

Coarse

Fine

1/4 (.025)

2350

2700

3800

4350

4750

5450

5/16 (.3125)

3900

4300

6300

6950

7850

8700

3/8 (.375)

5900

6500

9500

10600

11800

13200

7/16 (.4125)

7850

8800

12800

14400

15900

17800

1/2 (.500)

10500

11800

17000

19200

21300

2400

9/16 (..4375)

13500

15000

21800

24400

27300

30400

5/8 (.625)

16700

18900

27100

30700

22900

38400

3/4 (.75)

24700

27600

40100

44800

50100

56000

NOTE: There is a 11% increase in strength from a coarse to fine thread bolt

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