Rotary cutting tools with through coolant channels are disclosed. The rotary cutting tool includes a rear shank portion, a cutting portion with flutes extending from the shank portion along a longitudinal axis, at least one front end cutting edge, a central coolant channel extending along the shank portion and the cutting portion, and contoured radial coolant channels in flow communication with the central coolant channel. The contoured radial coolant channels extend from the central coolant channel to outlet ports adjacent the front end cutting edge(s). Additional radial coolant channels may also be provided in the cutting portion with outlet ports adjacent the flutes.

A body of a cutting tool may include a shank and a tip having spaced-apart, helical flutes. Each spaced-apart, helical flute may include a helical cutting edge extending from a tip bottom, adjacent a shank top, to a tip top. The tip may include chip gash paths. Each chip gash path may be recessed between two of the spaced-apart, helical flutes, and extend from the tip bottom to a tip top portion. The body may include helical coolant channels extending from entrances at a shank bottom, to within a shank interior, to within a tip interior, to tip coolant orifice exits. The coolant orifice exits may be disposed in the spaced-apart, helical flutes adjacent the chip gash paths or disposed in relief surfaces extending from the tip top downward to the chip gash paths. The coolant orifice exits may be spaced-apart from the tip top.