Using a Torque Wrench Extension
Occasionally an extension, crowfoot, or other adapter is
necessary to use with a torque wrench to torque a bolt or
line fitting. Adding adapters or extensions will alter the
torque on the fastener from what the torque wrench
reads. Use the following formula to calculate the correct
torque wrench setting to achieve a specific torque value.
62364
L
F
T
W
T
S
T
E
L
E
L
W
Figure 1-3: Torque Wrench and Extension
F - Force applied by technician
L - Total length through which force is applied to fastener
TW - Torque applied at end of torque wrench
TS = TE (LW / (LW + LE))
TS - Torque wrench setting
TE - Torque specified at fastener
LW - Length of torque wrench
LE - Length of extension
Example: A component requires a specified torque value
of 65 lb-ft and a 6 inch extension is required to reach it.
What should the torque wrench setting (TS) be to
compensate for the extension?
Torque specified at fastener (TE) = 65 lb-ft
Length of torque wrench (LW) = 12 in.
Length of extension (LE) = 6 in.
TS = TE (LW / (LW + LE))
TS = 65 lb-ft (12 in. / (12 in. + 6 in.)
TS = 65 lb-ft (12 in. / (18 in.)
TS = 65 lb-ft (0.666)
TS = 43.33 lb-ft
SPECIFICATION AND GENERAL INFORMATION
1
5100048604 (12-18)
1-5
Summary of Contents for PT Series
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