Torque

The twisting force applied to the screw through the screwdriver

 

Cam out

The tendency for a screwdriver blade to be forced out of the screwdriver slot

 

DIN

German industry standards (Deutsche Industrie Norm).

These are standards which give dimensional and performance details for screwdrivers.

 

ISO

International Standards Organisation.

These are also standards which give dimensional and performance details. They are usually an updated and expanded version of a DIN type standard.