Capscrew Markings and Torque Values
Caution: 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 engine damage.
SAE capscrews are graded according to the strength of the capscrew. They are marked on the head so the correct
strength and torque value are known.
The table on the following page lists the capscrew markings and the correct value for the capscrew. SAE capscrews
are identified by:
U.S. Customary [5/16 X 18 X 1-1/2]
5/16 18 1-1/2
Major Number Length
Thread Threads in
Diameter per Inch Inches
in Inches
NOTES:
1. Always use the torque values listed in the following tables when specific torque values are not available.
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.
Section V - Engine Component Specifications Capscrew Markings and Torque Values
N14 Page V-43
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