Capscrew Markings and Torque Values
When replacing capscrews, always use a capscrew of the same measurement and
strength as the capscrew being replaced. Using the wrong capscrews can result in
Metric capscrews and nuts are identified by the grade number stamped on the head of the capscrew or on the surface
of the nuts. U.S. Customary capscrews are identified by radial lines stamped on the head of the capscrew.
The following examples indicate how capscrews are identified:
Metric - M8-1.25 X 25
U.S. Customary [5/16 X 18 X 1-1/2]
1. Always use the torque values listed in the following tables when specific torque values are
2. Do not use the torque values in place of those specified in other sections of this manual.
3. The torque values in the table are based on the use of lubricated threads.
4. When the ft-lb value is less than 10, give consideration to converting the ft-lb value to in-lb to
obtain a better torque with an in-lb torque wrench. Example: 6 ft-lb equals 72 in-lb.