A protective wear cap for use on a trimmer head of a flexible line rotary trimmer including a cylindrical side wall terminating at its upper end in an upper mounting wall and at its lower end in a radially projecting protective flange. A mounting aperture is centrally disposed in the mounting wall of the wear cap so that a drive shaft of a rotary trimmer can extend through the housing and through the mounting aperture into the wear cap to be engaged by a fastening member securing the wear cap to the drive shaft of the rotary trimmer and to the trimmer head. The cylindrical side wall of the wear cap defines an axial length sized to position the protective flange thereon below the lowermost surface of the trimmer head to protect the trimmer head from wear during use.
