The design consists of a solid chuck body with and internal taper and locking sleeve. Two sets of three balls serve to lock the inserts.
The first set of balls locks the annular grove on the inserts taper and pulls the insert in an axial direction, while the upper sets locks in three of the six semispherical recesses and transfers the torque.
One-hand function – Model 80-4E
A variant of the chuck that has been simplified even further
The insert is released by lifting the locking sleeve
A new tool is applied with one hand since the return of the locking sleeve is done automatically