Patent ID: 8079789

Claim:
A tool coupling for connecting an adapter to a tool body having a central rotation axis, the tool coupling comprising a plurality of drivers, each driver includes a planar torque-transmitting side having a surface area that contacts a respective torque-side slot wall of the tool body when the adapter is clamped to the tool body, and a respective driver opposite side including a portion engaging a respective opposite-side slot wall, the respective opposite-side slot wall including a slip bevel portion formed at a bevel angle with respect to an axial direction of the rotation axis, the driver opposite side engaging portion having a surface area that contacts the opposite-side slot wall of the tool body when the adapter is clamped to the tool body, wherein the surface area of the driver opposite side engaging portion that contacts the opposite-side slot wall of the tool body is smaller than the surface area of planar torque-transmitting side that contacts the torque-side slot wall of the tool body when the adapter is clamped to the tool body, and wherein the torque-side slot wall does not include a slip bevel.