Grinder parts are the bits you replace so you don’t have to replace the whole grinder. Screens, scrapers, O-rings, the odd lid or magnet. A good metal grinder is built to last years, but the consumable pieces wear out long before the body does, and that’s usually what sends people looking for a new one when they didn’t need to.
Most of what fails is small and cheap. Knowing which part has carked it saves you a fair bit. A good grind matters more than people think, too. Feed a vaporizer an uneven, half-shredded load and it’ll heat patchy no matter how good the device is.
What actually wears out
The screen goes first, every time. It’s a fine mesh that lets kief drop through to the bottom chamber while holding back the ground herb, and it clogs, stretches or tears with use. A torn screen means your kief either stops collecting or falls straight through, neither of which you want.
After that it’s the threads and the seals. Cheaper grinders use plastic O-rings or friction-fit lids that loosen over time, so the top starts spinning loose or the grind gets gritty. The little pollen scraper that lives in the bottom chamber also goes walkabout constantly. They’re the spare everyone loses.
Teeth and magnets fail less often, but they do fail. Drop an aluminium grinder on tiles and you can chip a tooth or knock the centre magnet loose. That’s usually the point where a part swap stops being worth it.
Grinder parts vs a new grinder
The line is pretty simple. If the body’s sound and only a screen or scraper has gone, replace the part. A screen costs a couple of dollars against thirty or more for a decent grinder, so it’s a no-brainer.
If the threads are stripped or a tooth’s chipped, that’s a different story. You can grind around a stripped thread for a while, but it only gets worse, and a chipped tooth leaves uneven grind and shreds bits of metal you don’t want in your bowl. At that point you’re better off reading up on herb grinders again rather than nursing a dud.
For the difference between the cheap zinc jobs and the good stuff, metal grinders is the page to read. The build quality there is exactly why the better ones are worth keeping alive with spares.
Choosing the right screen
This is where people get caught out. Screens are sized by the inside diameter of the chamber, in millimetres, and you need to measure rather than guess. Hold a ruler across the inside of the screen housing, not the outside of the grinder.
A few things worth knowing:
- Mesh count. Finer mesh holds back more plant matter and gives you cleaner kief, but it clogs faster. Coarser mesh flows better and needs less cleaning. Around 100 to 150 is a sensible middle.
- Material. Stainless steel screens outlast brass and won’t taint the taste. Brass is cheaper and bends easily, which is handy for cutting to size but it won’t last as long.
- Cut-to-fit sheets. If your size is odd, a generic mesh sheet and a pair of scissors solves it. Cut a touch large and press it into the lip so nothing escapes round the edge.
Don’t overthink the kief screen if you don’t collect kief. Plenty of people never touch the bottom chamber, in which case a clogged screen barely matters.
Which brands sit where
- Premium spares, built to be serviced: Santa Cruz Shredder. Anodised aluminium, replaceable screens, and the teeth are the selling point.
- Modular and easy to fix: Kannastor. Designed to come apart, with screens and gaskets you can actually source.
The reason these two are worth a mention is that both were built with replacement in mind. A lot of cheaper grinders are sealed units where nothing comes apart cleanly, so when the screen tears you’re stuck. If you run a dry herb vaporiser day to day, a serviceable grinder is the one that’ll still be going in five years.
Honest practical tips
Keep a spare screen on hand before you need one. They always tear at the worst time, usually mid-grind with a full chamber.
Clean before parts wear, not after. Most “broken” grinders are just gummed up, and a soak in isopropyl brings them back. Resin acts like glue and grinds the threads down faster than they’d wear on their own.
Don’t soak aluminium for hours. Ten minutes is plenty. Leave it overnight and the anodising can dull and the metal goes cloudy, which doesn’t hurt the grind but looks rough.
And if you want the full rundown on grinders themselves rather than just the spares, All About Grinders covers how they work and what separates a good one from a cheap one.