MLB Baseball Bat Code Rules for Weight and Length of the Wood


Section 1.10 of the Official Rules of Major League Baseball (MLB) places strict limits on the design, diameter and length of wooden bats for competitive play. The rule book does not impose a limit on the bat's weight, however.

General Construction

  • MLB rules state that the bat “shall be a smooth, round stick not more than 2 3/4 inches in diameter at the thickest part and not more than 42 inches in length.” Each bat incorporates one solid piece of wood. The rules bar laminated or “experimental bats” from professional games—both regular season and exhibition—until the MLB Rules Committee approves the manufacturer's design.

Cupped Bats

  • Rules permit an indentation in the end of a bat's barrel that can measure up to 1 inch in depth, no wider than 2 inches and not less than 1 inch in diameter. The indentation must be curved, and the indentation can contain no foreign substance.

The Handle

Colored Bats

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