Adult baseball NABA bat rules (2027)
Varies by event. Bat rules here can change by state, event or league. Check your event's or league's rules before you buy.
| Stamp | Wood |
|---|---|
| Max barrel | — |
| Max length | — |
| Drop limit | — |
| Ages | 18+ |
National tournaments allow natural wood, composite wood and metal/wood bats. Local NABA leagues can differ.
What the stamps mean
- one-piece solid wood: One-piece solid wood is legal almost everywhere without a stamp. Multi-piece, laminated, bamboo and composite-wood bats usually do need a certification mark.
What size bat for NABA?
Height and weight matter more than age. These are typical sizes for an average-size player, from the Rawlings/Easton sizing chart and CDC growth charts. For your player's exact size, use the Bat Finder for NABA.
| Age | Typical length |
|---|---|
| 18 | 33"–34" |
Shop bats for NABA
These links open bats with the right stamp. Check the exact model against the official list before you buy. We earn a commission if you buy, at no cost to you.
Other Adult baseball divisions
- MSBL / MABL (Ages 18+)
This page summarizes the published rule. Your league or tournament can add its own, and its ruling is final. Confirm your bat isn't on a decertified or non-approved list before you buy. More bat questions.
Not sure what to buy?
The free Bat Finder gives you the length, the drop and the stamp your league requires in about 20 seconds.
Open the Bat Finder