To ensure that the correct torque is applied when using extension spanners , keep the extension “in-line” with the axis of the wrench (as shown in diagram). Should you wish to permanently use an extension spanner on the Dial Type Wrenches, we can lock the ratchet mechanism and re-calibrate the dial to show a true torque reading for that particular extension. The following table gives the value of dimensions “L” for all Dial Type Wrenches. It is important to have “L” dimension for any wrench where an extension is required.
| in. | mm | in. | mm | in. | mm | in. | mm | in. | mm | in. |
mm |
Dimensions “L” | 7.5 | 190 |
14.5 | 368 | 17.5 | 445 | 25 | 635 | 33.5 | 850 | 68 | 1727 |
Calculation for torque wrench spanners and adapters with a dial wrench
When
using extension adapters and spanners, the torque applied to the nut is greater than that shown on the torque wrench dial. To calculate the increase, use the following formula:
TT = True Torque
DR = Dial Reading
E = Extension Length
L = Effective Wrench Length
All ADS*
models
BDS
A/AS/E/ES
Other
BDS Models
CDS Models
DDS Models
EDS Models
Note!
*Due to the low torque ranges and high accuracy it is recommended that models ADS4 and ADS8 should not be used with extension spanners and models ADS3, ADS8 and ADS12D should not be used with extension adapters.
