Hale has a 4.48 ERA in 66 games (20 starts) in parts of four Major League seasons with the Braves and Rockies. He's posted a 3.93 career Minor League ERA in 126 games (82 starts).
Baltimore's 40-man roster is now full.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.