A hammer drill includes a boss sleeve rotatably and externally mounted to an intermediate shaft separately from the intermediate shaft. The boss sleeve includes a rod coupled to a rear end of a piston cylinder via a swash bearing. The boss sleeve is configured to rotate to convert a rotation of the intermediate shaft into a reciprocating motion in a front-rear direction of the rod and transmit the reciprocating motion to the piston cylinder. The hammer drill includes a second clutch disposed at the intermediate shaft. By performing a switch operation of a slide position of the second clutch, a hammer mode in which the second clutch is engaged with the boss sleeve to reciprocate the piston cylinder back and forth and another operation mode are selectable. The boss sleeve is rotatably cantilevered not to be in contact with the intermediate shaft by an inner housing via a bearing.

A power tool includes a drive mechanism including an electric motor, a housing, and a spindle rotatable about a longitudinal axis in response to the drive mechanism. The power tool further includes a lockout mechanism including a plurality of detents asymmetrically positioned around the longitudinal axis, where each of the detents are movable between a locking position and an unlocking position. The power tool also includes a collar rotatably coupled to the housing, the collar including a plurality of recesses asymmetrically positioned around the longitudinal axis, wherein in the unlocking position, each of the detents is received in one of the recesses and the spindle is axially movable within the housing, and wherein in the locking position, at least one of the detents is not received in one of the recesses and axial movement of the spindle is prevented by the lockout mechanism.