a. Measure the diameter of the screw you are installing.
b. Count the number of threads per inch.
Under the heading SIZE, look down the left-hand column until you find the diameter of the screw
you are installing (there will usually be two lines beginning with the same size).
d. In the second column under SIZE, find the number of threads per inch that matches the number of
threads you counted in step b.
CAPSCREW HEAD MARKINGS
Manufacturer's marks may vary.
These are all SAE Grade 5
To find the grade screw you are installing, match the markings on the head to the correct picture of
CAPSCREW HEAD MARKINGS on the torque table.
Look down the column under the picture you found in step e. until you find the torque limit (in ft-lb
or Nm) for the diameter and threads per inch of the screw you are installing.