Washers for Rotatable Cutting Tools

A cutting tool washer for use with a cutting tool bit, the washer comprising:

• an annular flange centered around the longitudinal axis comprising an annular flange outer diameter, an annular flange inner diameter, a washer front face, and a washer rear face opposite the washer front face;
• and
• a central hole extending through the annular flange centered around the longitudinal axis comprising a central hole outer diameter, wherein
• the washer rear face comprises a washer rear surface substantially perpendicular to the longitudinal axis, and
• the washer front face comprises a tapered front surface arranged at a slant angle As measured from a direction perpendicular to the longitudinal axis such that the annular flange comprises an inner washer thickness TI, an outer washer thickness TO radially outward from the inner washer thickness TI, and the outer washer thickness TO is greater than the inner washer thickness TI.

A rotatable bit comprising:

• a bit head including a collar centered on a central longitudinal axis;
• and
• a generally cylindrical shank extending rearwardly along the longitudinal axis from a rear of the collar wherein
• the rear of the collar comprises a collar conical surface tapered at a collar angle AC radially inward and rearwardly from an outer diameter of the collar.