ASA vs. USA vs. USSSA Softball Bat Stamps: Which Bats Are Legal Where

Short answer: ASA and USA Softball are the same organization. The Amateur Softball Association renamed itself USA Softball on January 1, 2017, and the bat standard did not change, so an older ASA-stamped bat and a newer USA Softball-stamped bat are legal in exactly the same places. The stamp that trips people up is USSSA: a USA/ASA bat can be used in a USSSA game, but a USSSA bat cannot be used in a USA/ASA game.

Everything below explains the stamps you'll see on the taper of a softball bat, which leagues require which, and how to check a bat you already own.

Last reviewed September 2026. Associations update their rules and non-approved lists every year; confirm with your league director before you buy.

Every softball bat stamp, in one table

The stamp is printed or laser-etched on the taper, the narrow section between the grip and the barrel. Many bats carry two or three stamps. If your league's mark isn't there, the bat isn't legal there, no matter what else it says.

Is ASA the same as USA Softball?

Yes. ASA (the Amateur Softball Association of America) had been the national governing body for softball since 1933. It rebranded as USA Softball effective January 1, 2017. The rulebook, the bat testing program and the performance limit all carried over. In 2019 the organization introduced new certification marks with the USA Softball logo, and they began appearing on bats in 2020. Bats with the older ASA 2000, 2004 and 2013 marks were grandfathered in and remain legal.

So when a league says "ASA bat required," any bat with the ASA or USA Softball mark qualifies. When a product page says "USA/ASA," it means the same single stamp. And when a bat says only "USA Softball," it is legal for ASA play, because they are the same thing.

The one exception: USA Softball keeps a non-approved bat list of models that were certified and later failed a retest. Most are older Easton Synergy and Stealth, Miken Ultra and Freak, and Louisville Slugger Catalyst models. If your bat is on that list, it's illegal in USA Softball play even though it has the stamp. That's why some of those bats turn up in "why is this bat banned" searches.

The one-way rule between USA and USSSA

USA Softball limits batted ball speed to 98 mph. USSSA's slowpitch standard, a 240 lb compression test, allows a livelier barrel. Because a USA bat is under the stricter limit, USSSA accepts it. Because a USSSA bat is over that limit, USA Softball does not.

• USA/ASA bat in a USSSA game: legal, but you're giving up performance to everyone swinging a USSSA bat.
• USSSA bat in a USA/ASA game: illegal. It will be pulled, and in many leagues the batter is out and may be ejected.
• Dual-stamped bat: legal in both, built to the USA limit. This is the right buy if you play in both and only want one bat.

Same model, different versions: manufacturers often sell a bat in a USA version, a USSSA version and a dual-stamp version with nearly identical paint. The DeMarini Mercy and Merciless are USA-only; the rest of that line is USSSA/NSA/ISA. The Easton Tantrum comes both ways. Read the taper, not the graphics.

Slowpitch: what changed with the USSSA 240 stamp

Until 2020, USSSA slowpitch bats carried the 1.20 BPF "thumbprint" stamp and were built to roughly 220 lb of barrel compression. In 2020 USSSA moved to a 240 lb standard and a new NTS mark; manufacturers had to stop building the old models by September 2020 and stop shipping them to dealers by the end of that year. USSSA initially said thumbprint bats would stay legal indefinitely, then reversed course: since January 1, 2023, only 240 NTS bats have been legal in USSSA tournament play. Some local USSSA leagues and most senior associations still allow the older bats, so if you have one, ask your director before you retire it.

Practically, every new USSSA slowpitch bat you buy today is a 240. See what you're choosing between in the slowpitch bat buying guide, or shop all slowpitch bats.

Fastpitch: the USA stamp does most of the work

In fastpitch the USA Softball mark is close to universal. NFHS high school softball requires it (an ASA 2000, ASA 2004 or USA Softball mark, and the bat must not be on the non-approved list). College and most rec and travel programs follow the same standard. USSSA runs a large share of travel tournaments under its own 1.20 BPF fastpitch mark, and NSA and ISA have theirs, but the performance ceilings for fastpitch barrels are close enough that most bats carry the USA stamp plus one or more of the others.

Two things to watch:

• The ASA 2013 mark is not valid for girls' or women's fastpitch. It covers slowpitch and adult men's fastpitch only.
• A few high-end fastpitch bats are sold in a USA-only version and a dual-stamp version of the same model. If your daughter plays USSSA tournaments, buy the dual stamp.

Shop fastpitch softball bats.

Senior bats

Senior slowpitch bats are certified to 1.21 BPF by Senior Softball USA and built with thinner walls. They are not legal in any USA, USSSA, NSA or ISA game. USA Softball runs its own senior divisions and allows senior bats there only from its approved senior list. If you're eligible, the extra performance is real; if you're not, don't bring one to the field. Shop senior softball bats.

What about baseball stamps?

Baseball uses three different marks: USA Baseball for Little League and most rec leagues, USSSA 1.15 BPF for travel ball through 13U, and BBCOR for high school, college and now USSSA 14U. They follow the same one-way logic (a USA Baseball bat is legal in USSSA play, a USSSA bat is not legal in USA Baseball leagues), but the marks are different from the softball ones and none of them cross over. The full league-by-league breakdown is in the baseball bat buying guide.

How to check a bat you already own

1. Find the stamps on the taper. A bat with no stamp is only legal if it's solid wood or the league says so.
2. Match the stamp to your league's rule, using the table above.
3. For a USA/ASA bat, search the model on USA Softball's non-approved list. For NSA, check their non-approved list too.
4. When in doubt, ask the league or tournament director in writing before the season. Umpires enforce what the director tells them.

Buying new? Every bat on our site lists its approvals in the description. Bought a composite? Read how to break in a bat before the first game.

Direct Sports has sold softball bats from Pearisburg, Virginia since 1988. Not sure what your league requires? Email us the league name and we'll tell you which stamp to look for. Shop all softball bats, slowpitch softballs and fastpitch softballs.