TM 10-3950-672-24-2
Capscrew Markings and Torque Values - Metric
Metric capscrews are identified by the grade number stamped on the head of the capscrew or on the surface of
metric nuts. The higher the number, the greater the strength of the capscrew.
Commercial Steel Class
Thread Diameter
Torque
Torque
Torque
mm
N [ft-lb]
m
N [ft4b]
m
N [ft-lb]
m
5
6 [5]
8 [6]
8 [6]
6
9 [7]
14 [10]
15 [11]
8
24 [18]
34 [25]
38 [28]
10
43 [32]
64 [47]
77 [57]
12
77 [57]
112 [83]
137 [101]
14
127 [94]
180 [133]
216 [159]
16
195 [144
266 [196]
319 [235)
Notes:
1. Do not use these values when the torque values are specified in another section of the manual.
2. These values are based on clean, dry threads. Reduce the value by 10% when a lubricant is used. Reduce the value
by 20% if new plated capscrews are used.
Torque Specification
The B series engine uses parts that are of metric dimensions.
Always use caution to be sure that capscrews from the engine are put back in their proper locations.
When replacing capscrews, always use a capscrew of the same measurement and strength as the capscrew being
replaced. Incorrect capscrews can result in engine damage.
Metric Capscrew Nomenclature
M8
X
1.25 - 25
Length in millimeters
Distance between threads in millimeters
Major thread diameter in millimeters
5-364