Rules per USA Softball (fastpitch) official rules. View the source (verified July 4, 2026).
Barrel cap: 2.25 in
USA Softball (fastpitch) USA Softball fastpitch (all ages) requires a bat marked USA Softball (fastpitch). The barrel may not exceed 2.25 in. Typically ages 4-99.
2026 Official Rules of Softball, Rule 3 Sec 1: bat must bear a USA Softball certification mark, not be on the Non-Approved list, max 34 in / 38 oz / 2.250 in diameter. The bat rule is uniform across age divisions, so one band is recorded. The 2013 mark is valid only in Men's and JO Boys fastpitch/modified — mark-vintage nuance not modeled in v1. Pre-2000 wood-bat umpire-discretion exception (Rule 3 Sec 1.A.3) not modeled.
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