TM 5-3895-346-14
TIGHTENING PROCEDURE
LUG NUTS
TOOLS TO USE IN TIGHTENING CAP NUTS
A bar wrench
You can easily arrive at the proper torque with this simple tool. Since pound/feet of torque is weight applied x
distance in feet, the following example will help you determine applied torque:
A 180-lb mechanic, applying his full weight 3 feet out on the bar until the cap nut will no longer turn, will exert
540 lb ft of torque.
The torque wrench
This precision device has a readout gauge which indicates applied torque. It is essential in obtaining 100%
torque accuracy.
To check a bar wrench or an air wrench, you only have to apply the torque wrench on a previously tightened nut
and read the torque indicated on the gauge.
The only accurate way to verify torque is to check in the direction of tightening the nut and note the reading at
the point where the nut starts to turn.
Figure 5.
Figure 6.
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