Comandante C40 MK4
A premium stainless-steel hand grinder that ships with a glass catch jar - about as close to plastic-free as a high-end grinder gets, held back only by a plastic internal frame in the grind path.
The verdict: Minimal plastic contact
The body, crank, and axle are stainless steel, the burrs are Comandante's proprietary high-nitrogen martensitic stainless steel, and the knob is natural oak - the brand deliberately uses no aluminum. It ships with two jars: an amber glass bean/catch jar and a shatter-resistant clear polymer (BPA-free plastic) jar, so you can run the grounds path entirely in glass. The one unavoidable plastic is the "BPA-free plastic internal frame" inside the grinder that beans pass through on their way to the burrs; that keeps it from being a fully plastic-free grind path. Bearings use rubber seals, but those aren't in the food path.
Verification: Manufacturer confirmed · Last reviewed
What it's made of
| Part | Material | Food contact |
|---|---|---|
| body stainless steel (some models with wood veneer); no aluminum used; specific grade unspecified | Stainless Steel grade unspecified | No |
| burrs proprietary "Nitro Blade" high-nitrogen martensitic stainless steel, ~58 HRC; a specific proprietary alloy, not a standard 304/316 grade | Stainless Steel grade unspecified | Yes primary |
| internal frame (grind path) BPA-free plastic internal frame beans pass through; the one plastic in the contact path | Plastic other / unspecified | Yes primary |
| bean jar amber glass jar; clear glass jars also available separately | Soda-Lime Glass | Yes primary |
| catch jar (alternate) shatter-resistant clear BPA-free polymer jar; optional - a glass jar is included and can be used instead | Plastic other / unspecified | Yes primary |
| knob 100% natural oak, hand-made | Wood | No |
| bearing seals rubber seals on the stainless micro ball bearings; not in the food path | EPDM Rubber | No |
Comandante's flagship hand grinder, hand-assembled in Germany's Black Forest. The stainless-steel body and high-nitrogen "Nitro Blade" steel burrs are widely considered a benchmark for grind quality in a manual grinder. You crank beans loaded through the top down into a screw-on jar; it ships with two ~40g jars so you can grind directly into one while storing beans in the other.
Pros
- All-stainless body and burrs; no aluminum by design
- Ships with a glass catch jar, so the grounds path can be glass + steel
- Oak wood knob; premium build and excellent grind quality
- Steel burrs are extremely durable and rebuildable
Cons
- Internal frame beans pass through is plastic - not a fully metal/glass grind path
- Expensive
Notes
- Extra glass jars are sold individually and in 4-packs
- Older MK3 glass jars, crank, and pommel are backwards-compatible with the MK4
Categories: Hand Grinders
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://comandantegrinder.com/pages/faq brand states no aluminum used; ships one glass and one polymer bean jar; 100% natural wood knob; extra glass jars available
- review https://prima-coffee.com/equipment/comandante/c40-mk4-coman-pp retailer spec sheet - stainless steel body, high-nitrogen martensitic steel burrs, oak knob, "BPA-free plastic internal frame", rubber-sealed steel bearings, amber glass and clear polymer jars
- review https://www.amazon.com/Comandante-4260113435663-Nitro-Blade-Black/dp/B07JQ4P976 listing confirms MK4 ships with one brown glass jar and one clear polymer (shatter-resistant) catch jar
Independent reviews
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