h. TORQUE WRENCH ADAPTERS AND CONVERSION FORMULA.
(1) Torque wrench adapters (extensions) are used to tighten screws and nuts to specific values that
cannot be reached with a regular socket on the end of a torque wrench. This makes the dial or scale
reading less than the actual torque applied to the screw or nut. When using an adapter, determine the
dial or scale reading as follows:
Check your manual for specific torque value to which the screw or nut should be tightened.
Measure the length of your torque wrench from the center of the handle (point A) to the center of
the socket (point B). Record this measurement.
Multiply the above measurement by the desired torque. Record this product.
Measure length of adapter from socket end (point C) to screw or nut end (point D). Record this
Add length of adapter (step 4) to the length of torque wrench (step 2). Record this sum.
Divide the product recorded in step 3 by the sum found in step 5.
The value found in step 6 is your torque wrench setting. Set your dial.
Setting the torque wrench dial at the read-
ing found in step 7 will deliver the required
torque at the end of your adapter.
Metric equivalents deleted for clarity.
40 lb-ft required.
12 X 40 = 480 lb-ft.
1 2 + 4 = 16 inches.
480 = 30 lb-ft.
Torque wrench dial setting = 30.