Use of proper torque values is extremely important. Improper torquing can seriously affect performance and reliability.
Identification of fastener grade is always necessary. When marked as a high strength bolt (grade 3, 5, etc.), the mechanic
must be aware that he is working with a highly stressed component and the fastener should be torqued accordingly.
Some special applications require variation from standard torque values.
Reference should always be made to component overhaul procedures for
Special attention should be given to the existence of lubricant, plating, or other factors that might require variation from
standard torque values.
When maximum recommended torque values have been exceeded, the fastener should be replaced.
When referring to the applicable torque charts, use values as close as possible to the torque values shown to allow for
wrench calibration tolerance. An erratic or jerking motion of the wrench can easily result in excessive torque. ALWAYS
use a slow wrench movement and STOP when the predetermined value has been reached.
Torque wrenches are precision instruments and are to be handled with care to ensure calibrated accuracy. Calibration
checks should be made on a scheduled basis. Whenever the wrench might be either overstressed or damaged, it should
immediately be removed from service until recalibrated.
KNOW YOUR TORQUE WRENCH! Flexible beam type wrenches, even though they might have a preset feature, must
be pulled at right angles and the force must be applied at the exact center of the handle. Force value readings must be
made while the tool is in motion.
Rigid handle type torque wrenches are available with torque limiting devices that can be preset to required values and
which eliminate dial readings.