TM 5-3810-307-24-1-2
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.
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]
M8
1.25
25
5/16
18
1-1/2
Major
Distance
Length
Major
Number
Length
Thread
Between
in
Thread
Threads
in
Diameter in
Threads in
Millimeters
Diameter
per Inch
Inches
Millimeters
Millimeters
in Inches
NOTE
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.
V-10 Change-1
