USE OF ADAPTORS, EXTENSIONS AND UNIVERSALS
Torque is force applied at a distance.
The torque wrench's micrometer scale setting is always torque wrench square drive torque
(fig 4).
Anytime an adaptor, extension or universal is used with a torque wrench in such a way that the
fastener torque distance is different than the torque wrench square drive distance, an
adjustment to set torque is required to get proper fastener torque. Note that units of distance
and force must be consistent throughout an adjustment calculation (figs. 4 - 9),
Fig. 4
Fig. 5 – Fastener
torque equals
torque wrench
square drive torque.
Fig. 6 – Using
wobble extensions/
universals with
torque wrenches.
Fig. 7 – Fastener
torque is greater
than torque wrench
square drive torque.
Fig. 8 – Fastener
torque is greater
than torque wrench
square drive torque.
Fig. 9 – Fastener
torque is less than
torque wrench
square drive torque.
4