Motion Pro 08-0380 - Manual (Page 2)

TORQUE ADAPTER EXTENSION FORMULA
To recalculate a torque specification when using the
Adjustable Torque Wrench Adapter, use the following formula:
Corrected Torque Reading = Torque Required x Wrench Length
Wrench Length + Extension Length
T = Actual torque reading as listed in the service manual.
R = T x L
L + A L = Torque wrench length. This is the length of your torque wrench--center of
grip to center of drive (see Fig. 2 on page 1). Refer to the instructions that
came with your torque wrench to determine how to measure this length.
A = Extension length (see Fig. 2 on page 1).
R = Corrected torque reading. Torque value to set on torque wrench.
NOTE: Always use the same units (in, ft, mm, cm, etc) for L and A. Do not use the torque adapter extension
formula if the wrench is at an angle and not parallel to the handle of the torque wrench because distance “A” will
be decreased. When the wrench is at a 90-degree angle to the handle of the torque wrench, distance “A” will be
equal to zero (0) and no adjustment is required (see Fig. 1).
Example: To tighten an engine’s cylinder base nuts to 20 ft.-lb. with a 3 inch extension length
(combination wrench parallel to torque wrench handle), and a torque wrench with a wrench length
of 12 inches, compute the extension formula as follows:
1. List all of the known formula variables: T = 20 ft.-lb. (actual torque specification)
L = 12 in. (torque wrench lever length)
A = 3 in. (torque adapter extension length)
2. Plug-in each of the formula variables
into the extension formula: R = T x L = 20 x 12
L + A 12 + 3
3. Thus, you can solve the formula
as follows: R = 20 x 12 = 240 = 16 ft.-lb.
12 + 3 15
Solution: In this example, your torque wrench
would be set at 16 ft.-lb., but the cylinder base nuts would be tightened to 20 ft.-lb.
After recalculating the torque specification, write it down here for future reference.
Model Ft.-lb. N-m
Multiply By To Obtain
foot-pounds (ft-lb.) 1.356 Newton-meters
foot-pounds 0.1383 kilogram-meters
foot-pounds 12.0 inch-pounds
inch-pounds (in.-lb.) 0.01152 kilogram-meters
inch-pounds 0.1130 Newton-meters
inch-pounds 0.08333 foot-pounds
kilogram-meters (kg-m) 7.233 foot-pounds
kilogram-meters 86.79 inch-pounds
kilogram-meters 9.806 Newton-meters
Newton-meters (N-m) 0.7375 foot-pounds
Newton-meters 8.851 inch-pounds
Newton-meters 0.1020 kilogram-meters
To make conversions from one form to another, use the following torque conversion table:
I08-0380 10/2012 Page 2