Baseball Rules · Pine Tar · MLB Controversies
Why Is Pine Tar Illegal in Baseball? — The Full Rule Explained
Pine tar isn't actually fully illegal in baseball — it depends entirely on who's using it and where. Here's exactly how the rules work for batters, pitchers, and everyone who remembers the George Brett game.Quick Answer
Pine tar is legal for batters — illegal for pitchers, and illegal above 18 inches on the bat.
Batters can legally apply pine tar to their bat handle up to 18 inches from the knob to improve grip. Pitchers cannot use pine tar or any foreign substance on the ball — it alters spin and movement, giving an unfair advantage. Exceeding the 18-inch limit gets the bat removed from the game but does not automatically call the batter out.
The title of this article is actually a little misleading — and so are most of the articles that try to answer this question. Pine tar isn't illegal in baseball. It's partially legal, partially illegal, with a famous 1983 incident that changed the rules, a 2021 crackdown that changed enforcement, and a nuance most people get wrong about what actually happens when the bat has too much pine tar on it.
Let's set the record straight on all of it.
Pine Tar for Batters — Legal with One Restriction
Batters are allowed to use pine tar. Full stop. The sticky brownish-black substance derived from pine wood has been used by hitters for well over a century to improve grip — particularly in humid or cold weather when bare hands slip on the bat handle. It works by creating a tacky surface that allows hitters to hold the bat more loosely, which reduces tension in the hands and forearms and can translate to better bat speed and more pop on contact.
The only restriction for batters is the 18-inch rule.
MLB Rule 3.02(c) — The Bat Pine Tar Rule
"The bat handle, for not more than 18 inches from its end, may be covered or treated with any material or substance to improve the grip. Any such material or substance that extends past the 18-inch limitation shall cause the bat to be removed from the game."
Key note: The rule says the bat is removed — NOT that the batter is called out. Any play already made with the bat stands. This is the detail the 1983 George Brett incident ultimately turned on.
Why 18 inches? The restriction exists to prevent pine tar from transferring to the baseball — a pine tar-coated ball becomes difficult for pitchers to throw cleanly and for fielders to handle. The 18-inch limit keeps the tacky substance confined to the grip area and away from the barrel, where contact with the ball occurs.
Pine Tar for Pitchers — Completely Illegal
For pitchers, pine tar is flatly prohibited — and the reason is different from the bat rule. Pine tar on a pitcher's hand, fingers, or the ball itself alters the spin the pitcher can put on the ball. Increased spin rate from a tacky substance produces sharper breaking balls and more unpredictable movement that batters cannot reasonably adjust for. That's an unfair competitive advantage, not a safety or equipment matter.
MLB Rule 3.01 — Foreign Substances on the Ball
"No player shall intentionally discolor or damage the ball by rubbing it with soil, rosin, paraffin, licorice, sand-paper, emery-paper or other foreign substance."
Pitchers caught with pine tar or any foreign substance face immediate ejection from the game and a potential 10-game suspension on first offense.
Pitchers are allowed to use rosin — a powdered substance made from pine tree resin that absorbs moisture and provides a dry, slightly tacky surface — because rosin doesn't alter the ball's movement the way a true adhesive substance like pine tar or spider tack does. The rosin bag sits at the back of the mound for this purpose.
The 2021 Spider Tack Crackdown — Why Enforcement Changed
The use of foreign substances by pitchers had been technically prohibited for decades but loosely enforced for most of that time. That changed dramatically in June 2021 when MLB began mandating that umpires check pitchers for foreign substances multiple times per game.
The trigger was data — Statcast had shown an unprecedented spike in pitcher spin rates across the league, and analysis pointed squarely at substance use. The primary culprit was spider tack, an industrial adhesive originally designed for grip strength competitions, which had been quietly spreading through pitching staffs. Spider tack creates spin rates effectively impossible through natural grip alone.
The Max Scherzer check — what actually happened
In the immediate aftermath of the 2021 enforcement announcement, Max Scherzer — then with the Washington Nationals — was checked by umpires on the mound and became visibly irritated during the inspection. Scherzer was found clean and was not ejected or suspended. But his reaction became one of the defining images of the crackdown and sparked a broader debate about whether the checks were being applied consistently across the league. The incident was notable not because Scherzer was caught — he wasn't — but because it illustrated how normalized the checks had become overnight.
Famous Pine Tar Incidents in Baseball History
1983
The George Brett Pine Tar Game — the one that changed the rule
On July 24, 1983, George Brett of the Kansas City Royals hit a two-run home run off Goose Gossage in the ninth inning to put the Royals ahead of the Yankees 5–4. Yankees manager Billy Martin — known for finding every loophole in the rulebook — immediately protested, pointing out that Brett's bat had pine tar extending well beyond the 18-inch limit, up to about 24 inches from the handle.
The umpires measured the bat against home plate (which is 17 inches wide) and confirmed the excess. Under the rules as they existed at the time, the home run was nullified and Brett was called out — ending the game with a Yankees victory. Brett's reaction became one of the most famous moments in baseball history: he came charging out of the dugout in full rage, had to be physically restrained by multiple coaches, and was immediately ejected.
The Royals protested the ruling to American League president Lee MacPhail. MacPhail reversed the call 25 days later, ruling that the intent of the pine tar rule was to prevent baseballs from being discolored — not to penalize batters for a grip advantage. Brett's home run was restored. The game was resumed from that point on August 18, with the Royals leading 5–4 in the top of the ninth. The Royals won. The bat is now in the Baseball Hall of Fame.
2004
Julian Tavarez — pine tar on the cap
St. Louis Cardinals pitcher Julian Tavarez was suspended for 10 days after umpires found pine tar on the brim of his cap during a game. Tavarez acknowledged using the substance but claimed it was for grip in cold weather. The suspension was one of the first high-profile enforcement actions against a pitcher for pine tar specifically, setting a precedent for the ejection-plus-suspension penalties that followed.
2012
Joel Peralta — pine tar in the glove
Tampa Bay Rays reliever Joel Peralta was ejected and suspended for eight games after umpires found pine tar inside his glove. The check was specifically requested by Washington Nationals manager Davey Johnson — who had managed Peralta in Washington and knew about the habit. It was a notable example of opposing managers using their knowledge of a former player against him, and raised questions about how long the unofficial tolerance for pitcher substance use had been going on.
2021
The Spider Tack Era — league-wide crackdown
The 2021 crackdown went well beyond pine tar. MLB's Statcast data had documented a 5–8% increase in average spin rates across the league between 2015 and 2021, which analysis attributed largely to the use of tacky substances. Spider tack — an industrial adhesive — had become the substance of choice. Pitchers who had been using it saw their spin rates drop dramatically once enforcement began. Several pitchers were ejected in the weeks following the announcement. The crackdown effectively ended the spider tack era but reignited the debate about where the line between rosin and illegal grip enhancement actually sits.
Pine Tar vs. Other Grip Substances — What's Legal
| Substance | Legal for Batters? | Legal for Pitchers? | Notes |
|---|---|---|---|
| Pine tar | ✅ Yes — 18" limit | ❌ No | Most regulated substance in the game |
| Rosin | ✅ Yes | ✅ Yes | The only approved grip substance for pitchers — rosin bag at back of mound |
| Batting gloves | ✅ Yes | ✅ Yes | No restrictions |
| Spider tack | N/A | ❌ No | Industrial adhesive — banned, triggered 2021 crackdown |
| Sunscreen + rosin | N/A | ❌ No (gray area, now banned) | Common combination before 2021 — generates tackiness similar to pine tar |
| Grip tape | ✅ Yes | N/A | Covered by the same 18" bat handle rule as pine tar |
| Lizard Skin bat wrap | ✅ Yes | N/A | Popular modern alternative to pine tar on bat handles |
How to Apply Pine Tar to a Bat — the Right Way
If you're going to use pine tar the right way — legal, within the 18-inch limit, and properly applied — here's the process:
Step-by-step application
1. Clean the bat handle — wipe away any dirt or old pine tar buildup with a rag. Fresh pine tar sticks better to a clean surface.
2. Apply in thin layers — rub the pine tar stick or apply from a rag in a thin, even coat. More is not better — too much pine tar makes the bat feel sticky and heavy in the hands.
3. Stay below 18 inches — measure from the end of the handle (the knob end). The 18-inch limit is measured from the knob up. Mark it if you need to — getting a bat removed from a game because of excess pine tar is an avoidable distraction.
4. Let it dry briefly — two to three minutes before use gives it time to set. Fresh pine tar is stickier but more likely to transfer to the ball if the bat contacts one in the barrel zone.
Can Youth Players Use Pine Tar?
This varies by league. Little League Baseball rules prohibit pine tar and any sticky substance on bats entirely — not just limiting the amount, but banning it outright. The rationale is simplicity: youth leagues lack the enforcement infrastructure to measure 18-inch limits accurately, and the spirit of the rule is cleaner without the nuance.
USSSA, Perfect Game, and most travel baseball organizations follow their own rulebooks — some allow pine tar within the 18-inch limit (matching MLB rules), others follow the Little League prohibition. Check your specific league's rulebook before applying anything to a bat at the youth level.
Frequently Asked Questions
Why is pine tar illegal in baseball?
Pine tar isn't fully illegal — it's legal for batters on the first 18 inches of the bat handle. It's illegal for pitchers because it alters the ball's spin and movement, giving an unfair advantage. For batters, exceeding the 18-inch limit gets the bat removed from the game but doesn't nullify any play already made.
What happens if a batter uses too much pine tar?
The bat is removed from the game. Critically — and this is the lesson from the 1983 George Brett incident — any play already made with the bat stands. The batter is not automatically called out. The excess pine tar simply means the bat can't be used again that game unless the excess is removed.
What happened in the George Brett pine tar game?
On July 24, 1983, George Brett hit a go-ahead home run with too much pine tar on his bat. The umpires nullified it, calling Brett out — sending Brett into one of baseball's most famous rages. But AL president Lee MacPhail reversed the ruling 25 days later, restored the home run, and the game was replayed from that point. The Royals won 5–4. Brett's bat is now in the Baseball Hall of Fame.
Can pitchers use pine tar?
No. Pitchers cannot use pine tar or any foreign substance on their hands, fingers, or the ball. Pitchers caught with pine tar face immediate ejection and a 10-game suspension on first offense. The only approved grip substance for pitchers is rosin, which dries the hand rather than adding tackiness.
What is legal for pitchers to use for grip?
Rosin is the only approved grip substance for pitchers. The rosin bag sits at the back of the mound for this purpose. It absorbs moisture from the pitcher's hand and provides a slightly tacky but dry surface. Sunscreen mixed with rosin — which creates genuine tackiness — was used widely before the 2021 crackdown and is now prohibited.
Is pine tar legal in youth baseball?
It depends on the league. Little League Baseball prohibits pine tar entirely. USSSA and travel ball leagues vary — some follow MLB's 18-inch rule, others ban it completely. Always check your specific league rulebook before applying pine tar to a bat at the youth level.
The bottom line
Pine tar is legal for batters — on the first 18 inches of the handle. It's illegal for pitchers in any form. Exceeding the 18-inch bat limit gets the bat removed from the game but doesn't erase the play — the 1983 George Brett incident established that permanently. For pitchers, the 2021 spider tack crackdown closed the long era of tacky substance tolerance and established that umpires will check and pitchers will be ejected.
The rule isn't complicated. The enforcement history is colorful. And Brett's bat is in Cooperstown.