Drop-forged; all plug-in heads = Rectangular shank with spring retaining pin. This ensures a solid and secure fit of the plug-in head in the torque wrench.
To take customer’s own tools, e.g. a special crank wrench. The scale has to be corrected in accordance with the length of the part welded on.
Legend for drawing and formula:
l1 = Lever length without plug-in head
l2 = Adjusted reference dimension on the torque wrench
l3 = Lever length including factory calibration reference dimension
l4 = Reference dimension of the plug-in head
L = Total length of the tool
T1 = Torque to be set
T2 = Specified torque
Torque wrench with rectangular sockets.