Procedures For Measuring Fielding Gloves
Rules 3.04, 3.05, 3.06:
Official Baseball Rules 3.04, 3.05, and 3.06 describe proper glove measurements and should be enforced for all gloves used in Major League games. The key measurements are “J” and “A” lines (see Diagram Number 4 in the Official Baseball Rules). The “J” line from the top of the index finger (first finger) to the bottom edge cannot measure more than 13 inches.
The “A” line, palm width, measured from the inside seam at the base of the index or first finger to the outside edge of the little finger of the glove, cannot be more than 7¾ inches. The first baseman’s glove or mitt cannot be more than 13 inches from top to bottom, and the catcher’s mitt cannot be more than 15½ inches from top to bottom or more than 38 inches in circumference.
Measurements should be made from the front or receiving side of the glove, and the measuring tape should be placed in contact with the glove and follow all contours.
The umpire may measure questionable gloves at his discretion, or the opposing manager may request that a glove be measured. Each manager is limited to two such requests per game. All measurements will be taken by the umpire between innings only. If the glove is illegal, it will be temporarily confiscated. A player refusing to obey the umpire’s order may be ejected from the game. Play that has transpired prior to the measurement will be allowed to stand.