A grinder seal is a small sealing ring (O-ring) that sits inside the grinder between the chambers. It ensures that the grinder turns smoothly, doesn't rattle, and closes tightly – so none of your material is lost.
What is the grinder seal for?
The O-ring has two functions: it holds the grinder halves neatly together and allows them to slide smoothly. Without it, the grinder would wobble, rattle, and allow material to pass through the gaps. An intact sealing ring makes the difference between a cheap and a pleasant grinder experience.
When should you replace it?
O-rings are wear parts. If the grinder becomes stiff over time, rattles, or sits loosely, the seal is usually worn out or dirty. A replacement ring is inexpensive and quick to change – often a thorough cleaning is enough.
Frequently asked questions
My grinder is jammed – is it because of the seal?
Possibly. However, residues between the teeth are more often the cause. First clean, then check the seal.
Does every grinder seal fit every grinder?
No, O-rings come in various sizes. Pay attention to the correct diameter for your model.
How do I clean the seal?
Remove it, clean it in rubbing alcohol, dry it, and reinsert it. See also Grinder Cleaning.
More on the topic
Before you replace the seal, a thorough cleaning is often worthwhile – we'll show you all methods depending on the material of your grinder.
→ Cleaning your grinder: The ultimate guide for all methods and materials
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