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HANDTORQUE® MULTIPLIERS

HANDTORQUE® TORQUE MULTIPLIERS

HandTorque® Torque Multipliers � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 47
Anti Wind-Up Ratchets (AWUR) � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 49
Torque wrench design offers just two solutions to the HandTorque®HT3-1000 � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 50

challenge of applying higher torques: either the load HandTorque®HT3 Series � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 50

at the handle must be higher or the lever length must HandTorque®HT4 Series � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 51

be greater. Clearly there are practical and safety limits HandTorque®Compact Series � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 52

to both of these solutions. Often there will not be the HandTorque®Compact Series Kits � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 53
HandTorque®Standard Series � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 53

space to operate a torque wrench of sufficient length HandTorque® Small Diameter Series � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 55
to comfortably apply such high torques and the chance UKAS Accredited Calibration Certification � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 55
that the wrench might slip off the nut increases as length
increases�
Norbar’s solution is to use a compact, epicyclic gearbox
called a HandTorque® multiplier to accurately multiply
the input torque provided by a torque wrench by a fixed
ratio. This fixed ratio might be in the order of 5:1, 27:1
or even up to 135:1 for very high torque application.
This means that a much smaller torque wrench can be
used for a given torque application and the combined
weight of the torque multiplier and torque wrench will
often be lower than for a single large torque wrench.
For example, one could apply 1,000 N·m using a Norbar
Model 1000 torque wrench weighing 5.8 kg or an HT-
52/22�2 combined with a NorTorque® 60 with a total
weight of just under 2 kg and a lever length of just
310 mm�
The Norbar HandTorque® multiplier range is the
most comprehensive available. Standard products
are available up to 47,500 N�m (35,000 lbf·ft)
and ‘specials’ to 300,000 N�m (220,000
lbf·ft). A range of ‘nose extensions’
for reaching difficult to access
bolts and a full range of torque
transducers for highly accurate
torque monitoring are available.

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