Oscillating multi-tool system

A power tool comprising:

• a housing;
• a motor disposed within the housing;
• a tool holder driven about an output axis by the motor, the tool holder having a first locating feature projecting from a surface of the tool holder, wherein the locating feature includes a tapered portion becoming narrower in a direction away from the surface of the tool holder, the first locating feature having a base and a base width;
• and
• an adapter having a face, an aperture, and a second locating feature projecting from the face for driving an output element;
• wherein when the adapter is mated with the tool holder, the first locating feature is received in the aperture, and the aperture has a width corresponding to the base width, wherein the base width of the first locating feature is greater than the width of the aperture;
• wherein a gap is defined between the surface of the tool holder and the face of the adapter when the first locating feature is fully received in the aperture;
• and
• wherein the tool holder includes a groove recessed from the surface of the tool holder, wherein the groove includes four arms extending substantially radially from the output axis.

A power tool comprising:

• a housing;
• a motor disposed in the housing;
• a tool holder driven by the motor, the tool holder having a surface;
• a groove recessed from the surface of the tool holder;
• and
• a locating feature projecting from the surface of the tool holder for engaging an output element that performs an operation on a workpiece, wherein the locating feature includes:
• a first sidewall angled away from the surface of the tool holder at a first angle with respect to the surface greater than 90 degrees, and
• a second sidewall substantially opposite the first side, the second sidewall angled away from the surface of the tool holder at a second angle with respect to the surface greater than 90 degrees;
• wherein the groove includes four arms extending substantially radially from the output axis.