Rancilio Rocky - MD40 - Obel Bregant Espresso Grinder Burrs

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Rancilio Rocky / MD40 / Obel Bregant 50 mm (suitable for Junior and Roma models only) espresso grinder burr set. Stamped on the back with the Rancilio symbol and "M.15". For Rocky users: the burr mounting screws reportedly get VERY tight and may strip when you try to remove them. You may want to consider purchasing an extra set of six, part number MR_25

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Manufacturer Italmill

5.00 Average

9 Reviews

Daniel L. Oliver

Very good quality burrs. Perfect fit for my Rocky grinder. Produced very fine grind for espresso. I would definitely buy these again.

Anthony J Pugliese

I make 1-2 cups of express a day and after about 12 months I find the new Obel Bregant Burrs make an improvement that is more than worts the price of the product



Swapped out my ~5 year old Rocky burrs and these work flawlessly. Improved my grind a fair bit in both speed and consistency. Excellent service from Espresso parts yet again as well!


I ordered this for an ECM grinder. The parts fit exactly and the grind is so much better! I am so pleased! The coffee is being ground more consistently and tastes better. It also grinds faster now. Why I waited so long I'll never know. Also, I ordered this on a Tuesday and received the next day! Way to go Espresso Parts People!


Similar to other reviews it had been some time since I’d changed Burrs (3+ years). In short, the impact has been: •quieter grinding •finer grinds that result in a better espresso •the machine is running far more smoothly and is laboring less (I thoroughly cleaned the inside of the machine as well - huge positive) The price to improvement process of replacing my burrs has been amazing especially when including a full clean of the grinder.


My Rocky is about 10 years old. I figured new burrs couldn't hurt. The relatively low price sealed the deal. I did take notice of the warning and ordered replacement screws, too. Good thing. The new and old burrs looked the same, but what a difference when running finger lightly over the faces: smooth vs sharp. The old burrs were really dull. It took about an hour to do the swap. Three screws came out OK, one screw came out with a mangled head, and I had to carefully drill the heads off of the remaining two. That's what took the most time. The result is a better grind, more crema, and a different sounding -- quieter -- running grinder. I'll not wait 10 years next time.


It's been too long since I bought my Rancilio Rocky and done anything about replacing the burrs. I can't believe what I missed from years ago when I was able to grind to a fineness needed for my espresso machine. With the burrs installed (easy to do), we're enjoying our espresso machine so much again because of being able to grind to the proper grind.


Got everything I needed to restore our 11 year old expresso grinder. It works like a new one now! Order was place and shipped almost immediately! The delivery vender was FedEx, they did not deliver for 3 days, but we paid for overnight delivery. Would definitely order parts hear again!