When to Replace Pinballs: How to Spot Chips, Rust and Wear Before They Damage Your Playfield
The steel ball is the cheapest part of a pinball machine and one of the most important. Every shot, every ramp, every inch of playfield art is touched by it thousands of times. A ball that has picked up chips, pits or rust turns into something closer to sandpaper, and it quietly wears down the things that cost real money to replace.
This guide explains how to inspect your balls, when to replace them, how to make sure you buy the right ones, and how to keep spares in good shape.
Quick answer
- Inspect balls regularly. Any chip, flat spot, pitting or rust is a reason to replace.
- Damaged balls scratch playfields, mylar, ramps and plastics. Replacing them is cheap insurance.
- Most machines use a standard 1-1/16 inch steel ball, but always confirm with your manual. Some games use special balls.
- Replace all the balls in a multiball game at the same time so they match.
- Store spares sealed and dry. Humidity is what rusts steel balls.
Why ball condition matters so much
A pinball rolls, bounces and slams into things constantly. When the surface is perfectly smooth and polished, it glides over the playfield and leaves little trace. When the surface has damage, every contact point becomes a tiny scraper.
Over time, damaged balls can:
- Accelerate playfield wear, especially in high-traffic areas like the flipper zone and inlanes
- Scratch and cloud mylar, so protective film looks worn sooner. See our mylar and wear protection guide.
- Scuff ramps and plastics
- Leave dark streaks and grime on the playfield, which makes cleaning more frequent
- Spread rust onto metal parts and contribute to grime build-up
Replacing balls costs little compared to repairing any of these. It is one of the easiest ways to protect a playfield.
How to inspect your pinballs
Take the balls out of the machine and look at them closely under good light. You can usually remove them through the trough or by lifting them off the playfield with the glass removed. Your manual explains how to access the ball trough for your game.
- Chips: small craters or flakes in the surface, often from hitting metal edges hard
- Pits and pockmarks: small dull spots that catch light differently
- Flat spots: uncommon, but sometimes visible as a dull band
- Rust: orange or brown spots, often from humidity or storage
- Dullness: a hazy surface rather than a bright mirror finish
- Feel: roll the ball between your fingers; any roughness is a sign of damage
The rule of thumb: if you can see or feel damage on a ball, replace it. A slightly dull ball can be cleaned. A chipped, pitted or rusty ball cannot be fixed at home and should go.
How often to replace pinballs
There is no fixed schedule, because wear depends on how often the machine is played, the game design and the environment. A machine played daily wears balls much faster than one played on weekends. Games with lots of metal ramps, ball locks or hard-hitting mechs can also be tougher on balls.
| Situation | What to do |
|---|---|
| Just bought a used machine | Replace all balls unless you know their history and they are spotless |
| Regular home play | Inspect when you clean the playfield; replace at the first sign of damage |
| Heavy play (parties, league practice) | Inspect more often; replace as needed |
| Machine stored for a long time | Inspect for rust before playing |
| Humid room or garage | Inspect more often for rust; consider better climate control |
Make ball inspection part of your regular routine. Our maintenance schedule shows where it fits alongside cleaning and rubber changes.
Buying the right replacement balls
Size
Most pinball machines use a standard 1-1/16 inch steel ball. That said, some games use different balls, and a few use special balls for specific features. Always check your manual or the game's documentation before buying. Our guide to finding manuals can help if you do not have one.
Finish and type
Replacement balls are sold in different finishes and grades, including plain polished steel and plated options. Many owners buy from established pinball parts suppliers so they get consistent, high-quality balls. Buying from an unknown source can mean balls that are not perfectly round or that have a lower-quality surface.
Quantity
Check how many balls your game uses. Many games use more than one, especially multiball games. Buy enough to replace them all at once, plus a few spares.
Match them up. Replace all balls in a game at the same time. Mixing new and worn balls means the worn ones keep doing damage, and slight differences in surface finish can affect how balls behave in the game.
How to replace pinballs
- Turn the machine off and remove the playfield glass. See our guide to cleaning and waxing the playfield if you want to combine the jobs.
- Remove all balls from the trough, locks and playfield. Some games hold balls in locks or mechs; check your manual so you do not leave one behind.
- Count them against the number the game uses.
- Wipe the new balls with a clean cloth to remove any oil or packaging residue.
- Install the new balls in the trough according to the manual.
- Power up and run a test or play a game to make sure the machine detects all balls correctly.
Some games need to "see" a certain number of balls in the trough to start properly. If the machine reports a missing ball or a ball search, recount and check the manual.
Cleaning and storing balls
Cleaning
Balls that are only grimy, not damaged, can be wiped clean with a soft cloth. Some owners use a mild cleaner, then wipe dry thoroughly. Never use abrasives, which will scratch the surface and defeat the purpose.
Storing spares
Steel rusts in humidity. Store spare balls:
- In a sealed bag or airtight container
- With a desiccant packet to absorb moisture
- Somewhere cool and dry, not in a damp garage or basement
- Separately from used balls, so you do not mix them up
What your old balls tell you about the machine
Damaged balls are not just a problem to fix; they are also a clue. Where and how a ball gets damaged can point you to something else that needs attention.
| What you see | Possible cause to look into |
|---|---|
| Chips that come back quickly on new balls | A sharp metal edge, a bent ramp entrance, a worn lane guide or a damaged ball lock |
| Rust spots | Humidity in the room or storage area |
| Black streaks on the playfield | Dirty balls combined with old wax and grime; time for a clean |
| Ball wear plus fresh playfield wear | Damaged balls already working on the playfield; inspect the flipper area and inlanes |
| Balls getting stuck or behaving oddly | Possibly the wrong ball size or a mech out of adjustment; check the manual |
If new balls keep chipping in the same spot, track down the cause before replacing them again. Run a slow test with the glass off and the machine powered down, rolling a ball by hand along the suspected path to feel for a catch or a sharp edge. Our playfield wear inspection guide covers how to read wear patterns.
If your machine lives in a humid space, ball rust is often the first warning sign of a broader problem. Humidity can also affect the playfield wood and electronics. Our game room setup guide covers room conditions.
FAQ
What size is a standard pinball?
Most pinball machines use a 1-1/16 inch steel ball, but some games use different or special balls. Always confirm with your machine's manual before buying replacements.
Can I polish a chipped or rusty pinball?
No. Chips, pits and rust cannot be fixed at home, and polishing will not restore a perfectly smooth surface. Replace damaged balls; they cost little compared to the playfield wear they can cause.
How do I know how many balls my machine uses?
Check the manual for your game. Many multiball games use several balls, and some hold balls in locks or mechs, so count carefully when you remove them.
Why does my machine say a ball is missing after replacing them?
The game may need to detect a specific number of balls in the trough. Recount, make sure every ball is seated properly, and check the manual for the correct count and any ball search procedure.
The bottom line
Pinballs are cheap; playfields are not. Inspect your balls whenever you clean the machine, replace any that show chips, pits or rust, buy the correct size from a quality source, swap them all at once, and store spares sealed and dry. If your balls are past it, find replacement pinballs on eBay and give your playfield a break.