Torque Limits for US Threads (inch-pounds)

Thread
Size

SAE Grade 2
74,000 psi Low Carbon Steel

SAE Grade 5
120,000 psi Medium Carbon Heat T. Steel

SAE Grade 8
150,000 psi Medium Carbon Alloy Steel
Dry Lubricated Dry Lubricated Dry Lubricated

#2-56

 2.7 - 3.3 1.7 - 2.5 4.1 - 5.1 2.6 - 3.8 5.8 - 7.1 3.6 - 5.3

#2-64

 2.8 - 3.5 1.8 - 2.6 4.4 - 5.4 2.7 - 4.0 6.2 - 7.6 3.9 - 5.7

#3-48

 4.1 - 5.0 2.5 - 3.7 6.3 - 7.7 3.9 - 5.7   8.8 - 10.8 5.5 - 8.1

#3-56

 4.4 - 5.3 2.7 - 4.0 6.7 - 8.2 4.2 - 6.2   9.5 - 11.6 5.9 - 8.7

#4-40

 5.7 - 6.9 3.5 - 5.2  8.8 - 10.7 5.5 - 8.1 12.4 - 15.2  7.7 - 11.4

#4-48

 6.2 - 7.6 3.9 - 5.7  9.6 - 11.8 6.0 - 8.8 13.6 - 16.6  8.5 - 12.4

#5-40

  8.4 - 10.2 5.2 - 7.7 12.9 - 15.8   8.0 - 11.9 18.3 - 22.3 11.4 - 16.7

#5-44

  8.7 - 10.7 5.4 - 8.0 13.5 - 16.5   8.4 - 12.4 19.1 - 23.3 11.9 - 17.5

#6-32

 10.6 - 12.9 6.6 - 9.7 16.3 - 19.9 10.1 - 14.9 23.0 - 28.1 14.3 - 21.1

#6-40

 11.8 - 14.4  7.3 - 10.8 18.2 - 22.2 11.3 - 16.7 25.7 - 31.4 16.0 - 23.6

#8-32

 19.3 - 23.6 12.0 - 17.7 29.9 - 36.5 18.6 - 27.4 42.2 - 51.6 26.2 - 38.7

#8-36

 20.3 - 24.8 12.6 - 18.6 31.4 - 38.4 19.5 - 28.8 44.3 - 54.2 27.6 - 40.6

#10-24

 28.0 - 34.3 17.4 - 25.7 43.3 - 52.9 27.0 - 39.7 61.2 - 74.7 38.1 - 56.1

#10-32

 32.0 - 39.1 19.9 - 29.3 49.4 - 60.4 30.7 - 45.3 69.7 - 85.2 43.4 - 63.9

#12-24

 43.9 - 53.7 27.3 - 40.3 67.9 - 83.0 42.2 - 62.2 95.8 - 117 59.6 - 87.8

#12-28

 46.9 - 57.3 29.2 - 43.0 72.4 - 88.5 45.1 - 66.4 102 - 125 63.6 - 93.7


Sizes ¼ - 1½ in.