Calculating the Torque Values When Using a Drive-
Adapter Wrench (continued)
determine proper tightening torque. When using a torque wrench with a drive-adapter
wrench, the calculated torque will be lower than the listed torque recommendation.
Example: The measured effective length of the torque wrench (distance from the
center of the handle to the center of the square drive) is 457 mm (18 inches).
The measured effective length of the torque wrench with the drive-adapter wrench
installed (distance from the center of the handle to the center of the drive-adapter
wrench) is 483 mm (19 inches).
The calculated torque conversion factor for this torque wrench with this drive-adapter
wrench would be 18/19 = 0.947.
If the listed torque recommendation for a fastener is 103 to 127 N∙m (76 to 94 ft-lb),
the proper torque when using this torque wrench with a drive-adapter wrench would
be 98 to 121 N∙m (72 to 89 ft-lb).
Specifications: Torque Specifications Page 2–6 4520P
09.40003Rev 00
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