


(d) He uses or attempts to use a bat that, in the umpire’s judgment, has been altered or tampered with in such a way to improve the distance factor or cause an unusual reaction on the baseball. Using a corked bat in Major League Baseball is in violation of Rule 6.06 (d), which reads in full: Corked bats are typically discovered when they break during play. However, this weakens the bat’s structural integrity and makes it more susceptible to breakage, even more so if the cork is placed beyond roughly six inches into the bat. Crushed cork, bouncy ball, sawdust, or other similar material is compacted into the hole and the end is typically patched up with glue and sawdust. To cork a bat, a hole approximately 1/2-inch (12.5 mm) in diameter is drilled down through the thick end of the bat roughly six inches deep. In Major League Baseball, modifying a bat with foreign substances and using it in play is illegal and subject to ejection and further punishment. A lighter bat gives a hitter a quicker swing and may improve the hitter’s timing. In baseball, a corked bat is a specially modified baseball bat that has been filled with cork or other lighter, less dense substances to make the bat lighter without losing much power.
